If you're for a man's right to be involved in the decisions about using or donating embryos, then you should probably support a man's involvement in the decision to continue or end a pregnancy, right? That's the logic of some anti-abortion activists, anyway, who say life starts at conception, and who see parental paternal [a telling typo, so I left it in] involvement as a way to chip away at the legal underpinnings of the pro-choicers.
The NY Times takes a look at the parallel legal histories of paternity and embryos as they exist in and out of the womb.