Im 22, and for the past 4 years or so (basically since I started birth control), I have a hard time staying wet during sex. It takes a bit to get me ready even though I want it really bad. And if we change position, need to withdraw by the time he is ready to enter again I'm practically dry. We have lube, but really dont want to use it all the time. This drying up makes sex blah and condoms hurt. Any suggestions as to why this happening