.. I think the issue of male reproductive rights greatly depends on the situation.
If the woman is raped, I think it goes without saying the man has no rights.
If the pregnancy occurs in a one-night stand, or a casual relationship, pregnancy (and it's resulting hardships) were not intended by either person in the relationship. Therefore, since the woman will have to bear the brunt of those hardships, it should be her decision alone.
The only case in which I would have any sympathy at all for 'male reproductive rights' people would be if the couple in question were deeply committed, and they had previously discussed and agreed to the conception of a child. If the woman backed out of that arrangement, after an agreement had already been reached, the man might have some grounds to complain.
Even then, it's a bit of a stretch for me. Seriously, dudes, have you never seen a recording of a woman having a baby? And you really think that's equivalent to having an orgasm? Give me a break