Um what? your boyfriend wants to "check" your vagina monthly?
What would he be checking for? It sounds like a pathetic scam for
sex. Now if your young and not ready for sex then your boyfriend is
a loser and you deserve better. And if you have had sex with your
boyfriend before and are giving him blue balls then i don't blame
him for trying to con you.
subsequently, the answer is no. its not right for your boyfriend
to check your vagina monthly. unless you want him to.
O_o But i still don't know what he would be checking for.