Why can't I have sex?

You’re probably over-doing sex, maybe try taking a break from it for at least 3 weeks and then try on the 3rd week, but don’t rush into it. Or you can also try masturbating a little bit more and see where that takes you.

This can be many things… first, if you feel pain any other time, or if your area is sensitive to touch to begin with it may mean you are swollen from over use. Also, it could mean you have an abrasion on the inside and it is slightly swollen and that will casue it to hurt when he goes in. Take a break and give yourself some time to recover! If that still does not work, you should consult a docter.