Yes, I know it was intended to be a joke but believe me, the ladies who suffer from them don't see it that way at all.
Let me put it another way. In a few year's time when your prostate enlarges and you are stumbling around cross legged in agony looking for the loo that isn't there and all your mates are laughing themselves sick - will you be joining in the general hilarity?
If you want to be funny about health matters, and there is often a lot to be funny about, the rule is to laugh about your own afflictions rather than others. That way nobody can be offended. I suffer from very poor hearing; a few years ago on a riverboat in Egypt I turned to my wife and said 'look dear, Deaf on the Nile!'
Colin