if someone is wearing a condom, and its not slipping off or anything, and ejaculates into the condom, is it bad to just keep going? (assuming it isnt rough sex or anything). sometimes i want to do this, to please the girl for longer.
No, not safe at all. Condoms must be removed immediatly after sex, while you're still erect. Use a new condom for each and every sex act.
xthevalkyriex is right. The danger is that the sperm will ooze out of the top of the condom as you soften, spilling semen on her labia which could be carried by vaginal secretions or further thrusting into the vagina, which I assume you do not want. Though I understand that guys can't always hold off cumming before the girl orgasms, you would be better off having a second condom at the ready so you can please her after you have ejaculated.
Unless you are not wearing a condom. So for instance, if you are in a monogamous relationship and are not using a condom, if you feel like it, continue with sex. My ex lover and i did, even though we had climaxed it felt wonderful to still have him move. To stop cold would be awful. But, with use of a condom, when he goes soft his semen will spill out. You don't want this so as soon as you are finished, get the bugger out of there
Have to say that I have broken a few. Always change condems after cumming. No reason to risk something. Just be quik about it. Take it off clean up and start working it up again. If you can keep going then good but if not it's not usualy a big deal. But DO NOT KEEP GOING WHITH THE SAME ONE.