If there’s one sex-related tip you could give to a partner/potential partner/all men/all women etc. what would it be?
Feel free to do something like;
As an example so you don’t have to limit your “one tip” to apply to everyone it tots don’t want to
Talk to each other about what you want sexually - yes it may scare some away but you will get what you want (and need) - nothing worse than being afraid to speak up …
When she is close to an orgasm and says that is it, keep it going right there or similar. Whatever you do dont change your position or rhythm 
Be open, honest and discuss everything - don’t let the communication breakdown 
When I was younger, it’s amazing how many of my mates looked at me confused when I advised them to keep playing with their partner’s clit during penetrative sex.
Looking really perplexed.
Then 1 or 2 weeks later thanking me for it. 
The penny must have dropped.
Don’t rush to orgasm, and don’t put the focus on the orgasm. Enjoy the connection.
Communication , honest . In years gone by , the only way my wife would let me know things she wanted to do that were on the edge of her normal was to be about half drunk . Some times if you or they tell you or you tell them , it is a hit or a miss . I found often it would plant a seed that later might grow to try whatever it was . Wouldn’t it be nice if people would not worry that their partner might be repulsed by something they wanted to try ?
Agreed been like that most of my life now im like this is me join me or try and join me or I may not be the person for you type deal
Communication is key for everyone. State needs, desirer’s, and listen to partners .
Don’t pull on it like you’re trying to unclog a drain with a plunger, had this happen once during a BJ when I was younger. I swear I thought she was trying to see if she could detach it
I wouldn’t say anything out of politeness but man I still remember how it hurt for days!!!
Not all men orq1q women are the same, don’t think that just because an ex enjoyed something that your current partner is the same. Communicate with your partner. If you have problems talking about sex maybe take test like spice it up. Give feedback during sex, a little moan or grinding can help partners understand what works for you
Every penis I have blown…the owner has had different preferences and techniques to how best to give them the ultimate pleasure for them.
So listen and as @Brian_Lisa says what works for one is exactly that…for that particular person.
Never presume
Never go out with a girl with big hands.
Makes your cock look small when she’s holding it 
Well said good advice 
Dont be afraid to say what your kinks are but dont be upset if the answer is no.