I always have tissues on the ready for the inevitable mess 
As a lot of others have said I usually have a tissue nearby unless of course I’m using a toy that’ll catch it all! It can become quite messy sometimes if I’m not prepared but I do agree that sometimes it can take the edge off, like it’s not quite as spontaneous.
Yes I prepare. I usually put a folded towel down and get a few pillows to prop myself up on. For clean up there are usually tissues and wipes in the bedroom anyway.
We just grab the nearest towel or boxers or something lol 😂
I make sure I have a pair of my wife's panties nearby in which to wrap my cock. Once I've cum the panties go straight in the laundry basket.
LV
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If my wife is not up to it, I cum on her thong while she watches. Usually wet wipes around for after. Love the smell of her thong.
Mostly use my fleshlight so usually cum in that. If I’m jus wankin usually cum in my shorts or use a sock lol
I almost never prepare and I like the feeling of it on me or to see myself cum or squirt I can cum and squirt multiple times so I would have to clean up multiple time and I squirt alot and the best part is when I do squirt it almost always is a real squirt it squirts up and out 💦and that would just ruin the fun and hot moment playing with yourself is supposed to be in the moment and hot and I like the taste of my cum it gets me turned on