Well nowadays even shounen have some "yaoi" to be honest. Didn't in ao no flag the dudes get married in the end? Or in another harem one didn't a dude do it with his classmate? Shoujo manga have nowadays too. 
Still you can't put the tag yaoi or shounen ai just because it features a gay relationship. 
So putting that "not yaoi" tag it helps someone......			  
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