What exactly is your concern?
Are you concerned because he will be examining and touching other women's genitals? Please keep in mind that those genitals that he will be examining will be diseased, covered in some kind of weird fungus/bacteria, crawling with an STD, soaked in some kind of weird discharge, exuding some kind of bizarre odor, or otherwise disgusting. Only a pure masochist would think sexual thoughts while doing a pelvic exam.
Are you concerned because he will be working in an almost all-female environment? The females that he will be working with will all be tired, sleep-deprived, overworked, and will probably yell at him for doing something wrong at some point. (Hey, all med students get yelled at at some point.) I doubt that that would excite him all that much either.
So don't worry about it.