how to get wetter

this might sound dumb but do any of yall get dry while being on the depo shot ? I never had this problem before but whenever me and my boyfriend get intimate, I would get really wet then get dry so quick then go back to being wet and back to dry. I know its not anything he's doing wrong bc I know I get really horny with him, and before I started dating him, it was the same thing with my ex boyfriend who I dated for a few years & started having that problem with him as well once I got on birth control . what should I do that would help ? drink more water ? take biotin ?