Anyone know why?:confused:

Some girls are embarrassed and don't know how to handle it maturely. It kind of puts them on the spot, so they giggle or laugh. Nervous emotional reaction.

Some girls find it amusing because they know exactly what the guy wants and he has just handed all the control over to her.

Some girls find it amusing because the guy looks quite silly when he is begging for sex.

But, if you are talking about teenage girls, it is most likely, the first one I listed.

I am sure there are other reasons as well, I just can't think of them right now. Point is, everyone is different and the reasoning for the reaction varies from girl to girl.