I would be careful using this rule. Women are, in general, most uncomfortable around weak/strange (but totally harmless) men.

Bring your average woman to a Richard Stallman meet-up and then to a UFC match and ask her which setting she found most uncomfortable. I can guarantee you that Richard picking his own nose in a room full of sweaty needs will be more disturbing to her than being close to thousands of jacked-up men cheering while two combatants almost kill each other.