Erection During Brazilian Wax What Could Cause A Guy To Lose An Erection During Intercourse?

What could cause a guy to lose an erection during intercourse? - erection during brazilian wax

OK, I said to my best friend (actually I have not, if the shame) and told me that her boyfriend loses his erection often during intercourse. It is 25 and has a history of hypertension. She was worried, it's a medical problem. What could be causing this?