An extremely embarassing experience in bjj

So bjj is fun and I enjoy it so far. However Ive been lucky enough to avoid rolling with women so far. However there are two really attractive women that sometimes come to the class. Luckily when they have come the class has been about escaping arm bars and whatnot. But if/when Im in the class and we were to go over how to get out of a hold in mount position and the women were to sit on top of me in mount position, I fear that um....natural male functions may take place and thats gonna be very akward. Help!