Erm, I hope this is a serious question so I'll give it a serious response.

It varies from girl to girl, sexual history notwithstanding. If things go well then some will give up the pussay straight away and they'll feel completely normal in doing so. Others will feel dirty/cheap/easy doing so or they just won't feel right or they just won't want to.

People have different sex drives so who knows. All in all the relationship is generally more rewarding than any sexual gratification you may derive.