How do you know you satisfy your boyfriend sexually?

You don't really know to be honest, after you have sex if your boyfriend is eager to have sex with you that means he's satisfied. However i'll just sum up some things because I'm not sure what you mean by just 'sexually'

If you are having sex then I really suggest you moan really hard and make out while he's doing it with you. I also suggest trying out new things like sex in the shower, it's lots of fun.

If you are giving oral which is personally one of my favourite things to do with my boyfriend, try something new like have him sit on the couch and you on your knees, if you have eye contact when giving a blowjob, the male gets really horny and attracted. Try deep throating, it's one of the best techniques and males love it. Handjobs are great but I personally prefer giving a blowjob.

I don't have much experience with anal but I suggest trying out new positions for this type.