There is conciderably less reported female to male rape out there.
Objectification is possible for men as well, yes.
However, it does not have the same implications for them because men are appreciated in capacities other than as sexual objects while women are regularly and frequently reduced solely to that of sexual object - men have bodily integrity beyond that that women are often not afforded. Furthermore, objectification of men is not institutionalized, supported by cultural, political, social, and economic tradition in the way that the objectification of women is. As a result, you don't see men starving themselves or binging and purging or surgically altering their body parts at rates anywhere near comparable to women, and they do not feel the same direct link exists between their worth and their appearance, for example. There is conciderably less reported female to male rape out there. However, it does not have the same implications for them because men are appreciated in capacities other than as sexual objects while women are regularly and frequently reduced solely to that of sexual object - men have bodily integrity beyond that that women are often not afforded.