I've seen Westworld season 1, Ex Machina, and Altered Carbon and I don't feel like the nudity is exploitative or excessive.
You suggest that the nudity is a (or *the*) selling point of these "mature" titles, and while it certainly is possible that it could be one of the draws of the genre, I feel that the term fits the titles you've mentioned. You sit a teen down in front Westworld or AC and they'll probably focus on the nudity / sex, but adults should be focusing on the "why" behind the skin.
Androids / AI don't have the same societal taboos about showing their genitalia--for most androids, they're superficial attachments added to appease the vanity of their human creators. I think galv makes some interesting points, if not overly specific at times, but the clothed / naked dynamic goes to show who has the power between creator and created. Androids in Westworld (season 1) are tools--nothing more, they don't have their own sexuality. You see the lines blur: a female engineer kisses one android to see if she feels anything; two androids share an intimate moment as they begin to realize their own plight. It's this blurring, or crossing, of the lines that whispers the question--what is human?
Of the three I've listed, I think Westworld's nudity is the most tastefully done and works only to advance the narrative. Altered Carbon is probably a bit more pulpy, but I didn't have a problem with it.
I mean, it's not like the two things need to be exclusive either. The adult comic, Heavy Metal, has been combining gratuitous with thoughtful (at times) science fiction for years. Game of Thrones is another non-SF example of rampant nudity that helps tell the story (at least in the first season, which is all I've watched). You could make the argument that men are not shown as often as females, and I'd agree, but nudity that fits the narrative is fine.