So my boyfriend isn't use to having sex as much as me (being a nymph) an often I wanna give him head before we have sex but he usually gets off an then we can't have sex after due to his penis being so sensitive. Why is this?
When he orgasms the head becomes very sensitive for a short time and it drives a guy crazy if he continues. That's normal but it shouldn't last for more than a minute or two. That feeling is so intense that some "nymphs" like to force the guy to endure it just to see him squirm and some guys like having that done to them.
If you are talking about just the normal sensitivity of his head that is there even before he comes you can work on reducing that by just handling his bare head a lot for several weeks. If you can get him into that it works best to have his head clean and dry and your fingers dry while you touch and rub it. Cleaning it with rubbing alcohol on a cotton ball works well but it feels funny. It feels hot at first then cold as it evaporates then it tingles a bit. I like that feeling myself. You say you are the experienced one so you shouldn't have a hard time making him do whatever you want, you know---mother knows best. lol