There are many people who don't really go by the gender of the assumed audience. There are also a lot of other things to consider too, such as orientation and gender identity, which can add to the question. Basically people are people, regardless, and you'll find plenty of guys reading shoujo manga just as you will girls reading shounen. The categories are less and less "hard and fast" rules as much as they are marketing guidelines, these days.
Speaking personally, I enjoy plenty of shoujo manga (though I'm not a straight guy like the original question asks). I like the often relatively innocent approach to romance and the magical fantasy that pervades some of the best stories, like a candy world that might shatter if touched. I especially loved many of the stories during the 70s, and I try to keep up with the few still running, like Patalliro!
It's always nice to see homage to that strong era too. I made a "kirakira sparkles" brush for Manga Studio 5/Clip Studio Paint a few months ago in honor of my favorite period. 
