 [ Symptoms ] i exercise daily and sweat a lot on my face and scalp could sweating and not washing my hair every day hurt it [ Disease ] you would need to address that question to the creator but ovaries are internal organs because they are very fragile and form eggs monthly that are seeking fertilization fertilization of course also takes place internally as well you can not really have babies growing on the outside of the tummy can we testicles are on the outside because spermatogenesis requires a cooler environment if the testicles were on the inside sperm would not be viable that is a very simplistic answer so i hope that addresses your question sounds like a take home school question to me