I'm struggling to find purpose in this story. The basic premise is: Alien comes to explore Earth, hates humans, likes sex, stays for the sex. So what? What are the stakes here? None that I can find. If he stays, he gets more sex. If he leaves, he what... won't get anymore sex? I get that the humans are manipulating him with sex so he'll stay, but to what end? I don't get it.
However, the bigger problem I had with this story was that the alien was so thoroughly un-alien. He wasn't an alien, he was a bitter human with a beak and long fingers who hated human society but loved sex. All of Bosch's thoughts, feelings, actions, etc. were based on human thoughts, feelings, actions, etc. The alien thought just like a human would. There was nothing foreign in our society to him and nothing foreign about his thoughts or actions to us. Seriously, replace every instance of the word "alien" in this story with, say, "foreigner", or "[name of country native]" and it would read exactly the same. Oooh, he couldn't speak our language because of his beak. So what? He could understand, read, and write it fluently. I say again, he's not an alien.
And I was very displeased that we didn't get some sort of full description of the alien. We get "beak", "long fingers", and "rough skin". Not enough.
I think maybe the problem I'm having with this story is that, in our oversexed society, here's a nifty little tale that says, "When the aliens come, our intelligence, inventiveness, creativity, adaptive abilities, and so on, won't mean a thing. All that matters is sex." And I take issue with that.