I think it depends on the person and how horny he is at the time. Usually, in most guys, it depends on the age of the guy too. Younger guys, in their teens and early 20s, can usually ejaculate and keep an erection and ejaculate again shortly afterwards...Or they can ejaculate and get it up pretty quickly after they came the first time.
This is more difficult to do as you get older. Most guys require at least 15-45 minutes after one orgasm to get another erection and have a second orgasm. Also, after the orgasm, usually the erection fades and goes soft within a few minutes. It depends on the guy, his health, his partner, how horny he is, etc.
I'm 34 and I can still keep a stiffy after I cum, but sometimes I don't want to cum again right away.
My boyfriend is havin problems ejaculating more than once when we have sex...When he jacks himself off he can go more than once but we have oral or intercourse he can only go once...Was wondering why?When we have intercourse he goes soft while inside of me or if im giving him oral or a hand job he goes soft...Why?