Crying

Seeing enough moe trends I would argue against this argument. A good population in Japan seems to get turned on by women crying, for whatever reason... :V

http://news.sciencemag.org/sciencenow/2011/01/a-womans-tears-the-anti-viagra.html

Well, I would agree that in the general case sadness would be a passion-killer and opt for a person to comfort the depressed individual rather than anything else. Hmm still I'm not sure their research can be general enough to apply to everyone... If I was REALLY interested I guess I'd look into their paper, but naaah. :V