sex help pls

so my boyfriend n I have always had sex kinda a lot n now he's away because of family issues so we only see each other once a month n so of course we wanna fuck like bunnies for the whole weekend but this last month the first night we had sex for a long time n I went dry so for the rest of the weekend my vag hurt to even touch so we couldn't even have sex at all!!  any tips on how to keep myself wet for longer??  or any lubes that won't irritate me ((I'm very sensitive)) n won't kill sperm or will actually help sperm as we are trying very hard to conceive??