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There's nothing wrong for the uke to sleep around like that since it was part of his job, there's a lot of mangas where the semes are hosts and they sleep around but didn't get the hate. Wow such double standards.

Anyways, the uke basically said that he felt that he was not attractive enough to get a guy easily that's why he chose to do the job. I can totally relate to this, being a gay guy and also an uke I also feel that I'm not attractive and it does limit the number of people interested in me, though I did not get myself into the same position as the uke did (the job etc), I also slept with a few guys because I longed for the warmth of a guy embracing me to make me feel wanted. Sometimes we need that.

I mean not everyone in this world can experience a good romance story and don't say that they should've tried to think of another way, life isn't that simple. Try to think of it in a different perspective rather than you ideal perfect qualities of an uke and a seme.
Maybe this can help you open up your mind about people who sleeps around. No hate guys, I'm just giving my personal thoughts on this^^