http://www.wired.com/2015/04/ex-machina-turing-bechdel-test/
The only example of a sexualised male bot in fiction I can think of is Gigolo Joe in AI, and maybe Schwarzennegers' insistence on being nude in Terminator scenes. Chappie, Johnny 5, the Iron Giant, HAL 9000, the nameless robots in the I, Robot movie; none of them had to put up with being a sex object. There is overwhelmingly a huge skew towards sexualised fembots, to the point where being sex objects is their usual definining characteristic in fiction, whereas other male or ambiguous bots have a chance to explore a larger philosophical world in fiction.