I know your pain. The other day my little sister made fun of me for watching Sailor Stars
Shows like that are actually designed to be appreciated by both sexes. It's quite similar to how most shonen anime features bishonen characters to appeal to the women. Like for example most guys can watch Get Bakers and they'd be like OMG hawt baking action! and the girls would be like OMG HAWT BAKER ON BAKER ACTION! The show appeals to both sexes, just on a different level.
Shoujo shows often feature stuff other then love taht often appeals to men, such as Fanservice, action, and a story. Since love is something that both sexes expericnce shouldn't it only be natural for both sexes to appreciate it?