Much more likely than this (just look at how current society operates):

By 2050, women are by far the largest consumers and users of sex robots, just as they are of current sex toys (among straight people, anyway).

Men who use sex robots just as occurs with men who now own RealDolls are seen as unsavory, pitiful and deviant. As, I might point, really all men who own sex toys are currently seen — by both men and women.

When it becomes more widespread, I’d say that 80% of straight sex robot use will be by women. Everything in society trends that way already, and though seismic changes do happen, I don’t see the conception of masculinity and femininity being shifted that much that quickly. It’d require epochal changes in norms that I just don’t see occurring with that celerity.

Hell, if I were a woman, I’d sure prefer a sex robot over the risk of the average man. Any day.