Yes, it does.
Now I could explain all the horrors of menstruating to you and ask you the same question ;P
Eitherway, i'll be the first to admit that I'm kinda rediculous when it comes to erections. I get distracted when it happens. And just stare. And I swear to god that during one of these moments I thought "One day you will grow to be a big, stiff, beautiful butterfly."
Don't judge, man.