A decent man knows that I am the decision-maker once the pregnancy has been started and not be so aggressive as to try to impose his will on me. You have one thing right, though. You guys have the power to decide whom you will have sex with and whom you won't. You make your choice much earlier in the situation. You have the power to do your homework and make your plans before you unzip your pants. In short, you have the power over your own body. If you want to play the whore with your own body, you have no right to complain whatever the result.
BTW: if you actually believed in, and personally followed, the line of sexual morality that says no sex before marriage, and, after marriage, sex only with your spouse, you would not be in this situation.