My personal opinion on this - and I don't think it should matter all that much since, as a man, I'm never going to have to carry a [insert preferred emotionally-loaded term here] inside me for nine months - is that whether a fetus is or isn't "life" (not a concept I think we should necessarily fetishize, but I digress) isn't important - maybe a fetus is "life", but I don't think it follows that it's therefore wrong to end it.
I
suppose there should be some kind of viability limit, which is (obviously) completely arbitrary, but that's inevitable considering we're having a ridiculous discussion about fuzzy, abstract concepts like "life" and "personhood" that are by definition arbitrary, and that will never be resolved because there aren't
actually such thing as right answers. Let's come up with a messy, unsatisfying compromise for all concerned and move on. Abortions for some, miniature American flags for others!
PS: FWIW, I think that - slightly cliché at this point, admittedly - Flo Kennedy quote about how "if men could pregnant, abortion would be a sacrament" bears as much repeating as it gets.
EDIT: Quoting this for the ages -
Masturbation, although immoral
There are people alive in the 21st century who believes this? Okay.