
not all yaoi have sex scenes. a lot are just about romance and fluffy love, like shoujo manga. there are definitely some similarities between shoujo and yaoi but they are just as definitely not the same (in my opinion. even though I don't read shoujo. it just doesn't do the same to me as BL)
personally I have NO idea why I love BL manga, honestly. I just do? It makes me feel all warm and happy inside haha
I also have pretty high standards for the art, so I do only like to read ones with good art, but I've seen plenty of people who don't care.
In the end, I couldn't really answer ur question as to why, sorry ┐(´~`)┌ I just think it's freaking cute

1-as hetero .. more men in front of me the better
.. why settle for one guy when I can have two for the same price .. hot men that love each other .. show their weacknesses .. let them self be vulnerable .. touch eachother
2-them assholes tho .. cute buttcheacks that hide this tiny hole .. you can put things is it .. toys .. big dicks so yeah you feel dominant .. in control
3- you see straight shit everywhere .. it's boring
4-shonen ai .. be having this cute cute cute couples .. their like my babies .. you wanna protec attac do not even want to dee them get dirty (that's a lie I'd kill for it .. moving on)
5-so yeah yaoi is cute but it can get hot or kinky or straight up psycho .. when shoujo hh girl don't make le laugh some weack ass stupid ass .. no sex scenes ass (not that I even want one) . You could feel bad for her if shit goes wrong .. but my babies .. you wanna flip tables ..carry guns.. kill some hoes..
6- some yaoi be straight up having good plots like .. did I mention the assholes ?? Yup it's the assholes

eyyy i wanna share my opinion too(≧∀≦)
I think they are similar in different ways,
like girls can get pregnant while in yaoi..unless it's a omegaverse. I also find both fun to read :D
well depends of the story. I like reading yaoi because it's pretty rare to see some gay couple in this world unlike here you can see your fantasies EVERYWHEREEE.
As a non-yaoi fan myself or fujoshi.
I wanna know the reason people are into two guys doing it. Although I have my theories, for example they just wanna see guys express themselves like how women do unlike the usual aloof hetero male would show or just by having better art than usual shoujo/romance manga, maybe even the decline of shoujo manga creators?
i personally think the shoujo manga and yaoi manga are basically the same.
*so the majority pretty much stated that they don't know why and I can respect that kind of mentality. I guess people are born to like them idk.