I mean it’s not that much of a surprise, it’s called a reproductive system for a reason. At least, it makes about as much sense as taking a pill by mouth to affect the functions of the uterus.

Same reason the birth control patch for women can be placed anywhere, below the belt just being the easiest to conceal (though too close to the groin has been known to cause cramping).

It’s like how some people load a dishwasher, it doesn’t really matter where you put stuff cause the hormones just go all over in there.