I've had two sex partners my whole life. I'm 20 and my second, who is my current boy friend is becoming really irritated that I have to pee A lot during sex. I'm no sure why I have to. I've read online that the sensation of peeing occurs while having sex but I pee like 4 times during sex. Especially because I don't want to pee on him if I orgasm. Please advice

Urinating during sex is generally caused by nerves in the bladder telling your brains that it's time to go to the toilet even when you don't need to or obviously particularly want to.
To help yourself in such matter; don't drink too much in the hours leading up to sex, use the toilet before you start your sexual actions, try to avoid sexual positions where you feel the most pressure on your bladder.. As a last results, you may seek medical help and use one of those meds that will orgonize the time for your bladder...

Hope this helped