Speaking of nosebleeds, do they happen only to guys? Do they only happen 
when they see/think of something sexually explicite?

Mostly, but Ryouga nosebleeds when he sees just a little skin.

	The most notable instance of female nosebleeding in anime is that of
Hazumi after Takumi kisses her near the end of Bakuen Campus Guardress Part
4.

(drip.... *SPLURT*)
(insert transformation sequence here)

-- 
"I will chide no breather in the world but myself,                 _____
 against whom I know most faults." - As You Like It         |_____|_____
                                     Act 3, Scene 2    _____|     |
            Julian Fong: fong_jh@sunset.bph.jhu.edu