I know there is a large group who like sex with dolls, the doll fetish. That isn't me. I am not interested in an inanimate and unfeeling, unresponsive object. There are various interesting things about sex with an android/ robot.
First, an android can be fully male and functional and yet still be a real virgin, not even know how to perform sex and it (the android) may not even have thought about sexual relationships. So there is the whole thing about corrupting something that isn't a child and does not have that innocence and yet it would not be the same as playing with an experienced adult. I'm not sure if this really appeals to me or not. I think I would rather have a partner who knows what is coming versus one who doesn't have a clue and thus can't begin to get excited until after the event. All that build up and suspense would be missing.
Second, on the other side, an android could be created for sex, for serving women. This side of the android is very erotic. It would have endless stamina, all kinds of knowledge and it is very unlikely to say no or be afraid or intimidated to try anything at all. However, would it be convincing as a sub? If it has less at stake than a real human male could it really put the same energy into submitting, being teased and tormented. Would chastity, for instance, have no real meaning for an android? Does it truly desire to be sensual or is it just one more thing on it's to-do list?
The android who serves it's master is erotic in spite of it's possible disinterest. It would obey. It would serve. There would be no need to feel bad about getting what you want out of the encounter. You could be very selfish and have no real concern for the enjoyment the android may or may not be having. At the end it could even clean itself up and leave you to do whatever you want.
This is another great thing about the android. It is easy to put away when you are done with it. Stuff it in the back of your closet, roll it under the bed or just leave it to stand out of the way in a corner somewhere, it makes no difference to the android. You can even unplug it, use the off switch to save power. If you get the deluxe model you can even have it stay on and perform in other ways: wash floors, drive you to work, answer all your emails, etc.
Wikipedia: Robot Fetishism - (also ASFR or technosexuality[1]) is a fetishistic attraction to humanoid or non-humanoid robots; also to people acting like robots or people dressed in robot costumes.
Technosexuality
Regina Lynn at Wired writes: 10 Reasons I'd Rather Marry a Robot.
10 Things you Always Wanted to Know About Robot Sex but were Afraid to Ask - article by Kal Cobalt.