I can see where you're coming from with this. I think you're having such a problem with it now because the 'C.O.G. Syndrome' (I made an acronym! Yay!) is more or less desensitized and/or completely absent for the men who are attracted to the opposite gender due to the over sexualization of most female characters that are damn near CONSTANTLY present in most Animes. So I guess, for better or worse, we're kind of use to it? You know, the whole moe thing and girls that look way older than they really are and vice versa.
People could argue that, "But they are 17 in the Anime! That is TOTALLY legal in Japan!" but that is a topic in a very grey area that I won't bother getting into. Again, totally see where you are coming from. Hell, even when I'm talking to 18, 19, and even certain 20 year olds, I have a little bit of reservation if we start flirting.
In the end, if you can enjoy it for what it is (which is NOT Yaoi xD), it is actually quite a fun series. Making fun of how they take off their shirts as if they were unsheathing Samurai swords might detract you enough to laugh at the ridiculousness of it all.
