Why is my cat trying to hump and bite my arm?

I don't know if it's because I'm pregnant or something, but my cat Sox started biting and trying to hump my arm or something. Like, he acted like how he would when trying to mount a female cat. He isn't neutered or anything, can anyone explain to me why he did that? Is it because I'm pregnant... show more I don't know if it's because I'm pregnant or something, but my cat Sox started biting and trying to hump my arm or something. Like, he acted like how he would when trying to mount a female cat. He isn't neutered or anything, can anyone explain to me why he did that? Is it because I'm pregnant and he's trying to 'assert his dominance' (lol) or something?
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