Why do men change after sex?
Physical Changes
Physiologically, men experience a series of changes after sex. Blood flow to the genital area decreases, and the body gradually returns to its pre-arousal state. Men may also experience a refractory period, a recovery time before they can become sexually aroused again.
Why does my boyfriend lose feeling after one round?
It’s called a refractory period. Initially, it becomes hypersensitive, then quickly loses all sensation capability for a short period of time. This is why men, in general, must stop before going again. As the refractory period wanes, so does the sensitivity “numbness”, which is why resuming “next round” takes longer