Dumb question maybe?

Becca

I know that this is probably a dumb question but im gonna ask it anyway. My boyfriend and I are doing long distance right now and so whenever we see each other we have a lot of sex. I've noticed that after so many rounds, I start getting really dry down there and I feel bad about it because I know its harder for him to continue. Is this a normal occurrence in females? What do you guys suggest for when it dries out down there?