to answer you frankly
we only get that rush and ohhh over them in manga and yaoi anime only most of us when it comes to real life we dont ship dudes with dudes or get any form of excitment from it. 
if your wondering about why is it so special in anime or manga well let me reference it for you in manga or anime if you notice the seme(the top) usually carry the same characterstics as all the men we find also appealing in the real world aggressive passionate poessive manly and dominant etc etc typical men characterstics but the twist is what they actually do to the uke(bottom) also a man but the characterstic responses mannerism and reactions they give off are a completely different how do i put it we are used to men acting tough dominant manly and staff but here with the ukes to be speicific we can also see the vulnerablitys they cry they moan they show more than the usual deadline emotions and if you notices the art styles they are usally more cute dare say a lil feminne with snitched waistline and staff and they blush too so to be frunk more than the real gay relationship out their to us most readers physcologically speaking even without knowing it their relationship appeal to us as more of the girl and boy ussuall verse but those vulnerablitys adds a spice to it that makes it even more delectable than the usual verse those vulnerablitys that to be frank we cant expect to see in the real world from my bf or any other and thats speaking abouts the majority not all

jb