7 Reasons that i hope answer your question:
1) Not worth mentioning when it's a rank down actual sex.
2) It's a limited discussion and too personal, as the process only involves you alone.
3) Leaving people to imagine you in action to your dirty mind and you have chosen to sexualize yourself for no apparent reason.
4) And that subjects your habits to an uproar when it comes to gossip.
5) Basically you're stripped of any authority and respect for being a ****er.
6) It also makes people suspicious of you hearing there is a chance of seducing men for your own ugly pleasure.
7) It is not a nice addiction to have over time and inconvenient if your level of arousal significantly increases in public.
I don't know why this differs in disparity between the two sexes but it somehow makes you look within range of unclassy, forever alone to dangerously ill.