Hello, I'm 22 years old, I'm 190 cm tall (6 feet and 3 inches) and my weight is 75 kg (165 pounds).
I have a girlfriend for 4 months now, the sex in the beginning was great, but now I'm facing a problem!
I get an erection after 15-20 minutes of foreplay and then after 5 minutes of sex I lose my erection. (she is my first sexual partner)
What's going on?
P.S. I barely drink, and I smoke about 1 ciggarette a day, in a great shape.