Gonna be honest. The scene where Usagi falls asleep at Ami's apartment and Mina sort of coos over her was a little odd. Would a teenage girl find another teenage girl cute? I mean, assuming Mina's straight.
Guys can to. It just depends. Like here in America, you might really get strange/nasty looks in a places like Louisiana or Mississippi (especially the smaller towns) if two guys are real close...but in places like Fort Lauderdale in South Florida, two guys can walk down the sidewalk holding hands or hugged up showing pure affection and no one really cares but in general, most cultures are fine with girls doing this more than guys.
I've heard in some places overseas its okay for guys to be close.
I really love how the senshi interact with each other. It's how everyone should be with the people closest to them for sure.
I also like how their intimate bond powers Sailor Moon up. The series has some really strong emphasis on friendship that are golden.