Syndactyly
I don't think you'd be mauled by yaoi fangirls. You don't fit the bill. Unless your boyfriend looks like a little girl. Then it might work.
He's the taller one... He's totally fan girl meat because his he's got this half long swishy hair thing going on. They're not fussy as long as you're both male and not fugly as hell they maul you.
I went to the movies with him once and we were waiting in line and he brushed some lint off my shirt and these two girls behind us actually giggled and one said something to the effect of "excuse me, are you two like gay together?" I looked back kind of shocked someone would ask something like that... I mean really... and then she apologised and said she asked because she was totally into gay Japanese stuff... we kinda told her not to worry about it and stood pretty ridged in the line after that...
Now if a piece of lint can attract that much attention...