I had a housemate who was a christian and asexual who was actively repulsed by all genitalia and nakedness (I once saw him physically recoil from a naked breast), and he seemed to cope okay with the content of his course. Bmedsci has a lot of labwork and biochem compared to a medical degree, and depending on your module choices there's no reason why reproductive systems should be a major focus of your studies at all. If it's what you want to do, go for it.