Well, quite a bit can leak out right away, particultarly if you get up too quickly.

I've seen about a teaspoon full escaping from me - and if my boyfriend hasn't made love to me for a few days it can be a bit messy. It's known as a "creampie". Some women dont like it, but it think it's just natural and part of the fun. Semen will gel around the cervix to ensure that the sperm have a greater chance to enter the womb.

This "plug" will melt after about 20 minutes and there will be more leaking then, anime gay sex but not so noticeable as the initial "creampie" as the white colour goes clear. Very tiny amounts of semen can leak for several days, but only special tests can reveal it.

There's a test kit you can buy online - usually used to catch out women who've been cheating by detecting small traces of semen in their panties.