I have a good few contenders and my absolute favorite does change from time to time.
if pushed I’d probably say the time I was properly dominated for the first time. I was blindfolded, ballgagged and cuffed, and then used and abused for several hours. It was absolutely amazing and really started off a love and blindfolds and gags that I still have to this day.
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I dunno about favourite but one that’s up there is the first time I was properly spanked…
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I think that my favourite sex memory is the first time I made my OH orgasm through oral sex. She had other lovers try, but none of them had every made her cum through oral along.
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So cool when you get a “first” with a partner.
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I came home from a business trip and found my wife in bed, masturbating. I watched quietly for about five minutes, getting harder and harder. I jacked off, watching her buzz herself with a vibrator until she came hard. I needed relief myself, so I climbed into bed and spread her legs apart and then inserted my cock into her until I gave her about a gallon of cum.
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Would have to be first time my wife experienced a vaginal orgasm during intercourse (after over 15 years together), was completely unexpected, and very intense and overwhelming. Thankfully this was first of many occasions and felt like we’d upgraded our sex life overnight.
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First time myself and my OH started swinging. We met a great couple who were willing to let us join them. We went with the intention of soft swinging. Just watching them and them watching us. We let each other play with each other my OH giving him head while his partner pleasured myself. Myself and my OH had a great fuck while watching the other couple, afterwards we sat chatting for a while, when the other gent started playing with my OH breasts and fingering her pussy. Myself and his partner watched as they pleasured each other with foreplay. I said to his wife that I could tell that he was desperate to fuck my OH. She laughed and said to her husband do you want to fuck her, off course his reply was yes but my OH looked at me and asked can I? Which I said of course. It was the first time I had watched my OH fuck another man, god knows how many I have watched her fuck now over the years from that first time.
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Off the top of my head it would be first time I remember giving my OH multiple O’s. We were in college and I had more stamina back then haha but she rode me to 2 of my O’s and at least 12 of hers before she passed out from the pleasure.
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When I was in uni with my then girlfriend. We didn’t have a condom but we super horny so she was rubbing my member against her clit. We’ve done that a few times and she’d manage to get me to come over here clit and keep on going until she finished herself off
However this time she puts it in and she whispered in my ear ‘I want you to come in me’ It was the first time that we hadn’t used a condom ( or any contraception) so the ‘danger sex’ factor was high. It was an awesome experience, and the spontaneity of it has always stuck with me. I don’t think we got much sleep that night…
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The first time my wife swallowed my cum. I’d let her know I was close, expecting her to stop and she just kept sucking. I was in heaven haha
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The first time my wife rimmed me. She told me she’d been talking about sex with some friends and asked if I’d mind if she could try something with me but wouldn’t tell me what it was, just that I should trust her. Absolutely blew my mind and my load! lol. She went on to use a finger inside me which was equally pleasurable
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The first time oh and I got naked! I was kinda nervous, but that soon stopped and I got hard and started oozing precum.
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First time my OH swallowed.
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First time she swallowed - or tried to - she puked. Second time and from then on, swallow and no problem
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Have a few actually.The time my ex wife had two Spanish guys spit roast her on a beach in Majorca as i hid and watched or the time on the same holiday as she seduced a room service waiter as i sat and viewed the action before joining in.Another time many years ago i spent the whole weekend in Phuket with my Thai GF and two gorgeous Thai T-Girls where we tried absolutely everything.Recently it was watching my new wife and her friend remove their bra’s in front of us Sissy husbands before swapping them and giving them to us to masturbate into.We both shot loads into the insides of the cups and gave them back.The look of sheer pleasure on my wife’s face as she put that sperm splattered bra back on coating her big boobs in another mans Sissy cream was incredible.After a few minutes she removed the bra and rubbed it on my face telling me to lick before making me lick her breasts clean too.At the same time the other Sissy licked my sperm off his wifes boobs.This little session actually seems more sexually erotic compared to the earlier described adventures as OH is/was such a shy person.
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I’ll say a few 
My husband’s face and amazement the first time vanilla me said to him, pull my hair and spank me; 
The first time I had anal sex, the pleasure I had was so intense that everything around me seemed brighter; 
The first time I pegged my husband is just unforgettable; 
The first time I was facefuxxed while tied up; 
The first time I tried DP;
My first times were also his 
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Honestly, the first time with my wife.
We’d been best friends for a couple of years before, and both in relationships.
There was occasional flirting, and tension when drinking, but we didn’t want to ruin the friendship.
Both became single within a couple of months, and we knew what would happen.
It was fast (extremely for me) and intense, close ripped off to orgasm in a few minutes.
She was on top as we came together, eyes about to pop out.
As we recovered there was definitely a mutual feeling of “So that’s how good sex is supposed to be”
Love reliving the memory together occasionally, which always leads to reenacting.
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The first time i sucked another mans cock and the first time he absolutely banged my back end ! And to be honest the next 10 months of the just raw gay sex we had, fantastic unemotional gay sex. 5 stars
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When me and my partner had a group session with another couple we have known for a while, me and my buddy both came inside her at the same time… it was hot to feel him blowing a load in her front while I filled her other hole 
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For me my best sex memories is the first time I made my gf squirt and everytime after that. as well as the first time my gf tried ansl and everytime after that how much she liked it. And the first time I had an orgasm from a prostate message
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