I could think of a couple of yaoi manga that don't have promiscuous bottoms... So no, not all yaoi manga have guys of that type.
And also, I believe that there are a fair lot of yaoi manhwa that do have promiscuous bottoms. I've not much to say about manhua because I don't read it all that much.
I don't mind if either of them are like that but I do wish that when the pairing becomes an official couple, they don't sleep with others anymore. There's something very troubling to me about someone who loses his viriginity to someone else even after liking someone he knows likes him back compared to someone who sleeps around but becomes loyal to the person he fell in love with, with all "temptation" aka. Blatant interest of other guys, being "unheard of" or at the very least, resisted. I don't like or prefer any of them to cheat on their partner, but I see more bottoms than tops do it, so...
Most I read are not like that? I mean there are some uke's who enjoy sex more than others. People are like that too though, some enjoy it more than others. Either, you are reading the wrong stuff or your just reading to much into it. There's always Shounen-ai I think that's maybe what you are looking for. but if you want a good rec that's yaoi and has a good story to it try http://www.mangago.zone/home/people/392673/home/ Hope I helped :)
Oops sorry I clicked something. Anyway that's the wrong link here you go :) http://www.mangago.zone/read-manga/rutta_to_kodama/
are u really read mangas?? not all of manga has slutty uke, maybe u just read yaoi thats why u always found it. fyi manga has more mature relationship thats why i like manga more than manhwa nor manhua. are u sure reading this manga till completed?? theres not many sex scene in here, rather than sexy, this story is more cute than i thought
Why tf In japanese mangas all uke are sex addict? And why tf der is never char development, feeling of connection witj the readers and are so fast forward and only sex sex sex? (^.^)
Korean and chinese mangas are way better
If dis continues den Japanese mangas will b bound to b disappear