When you put a condom on, so long as you do so properly, leaving that tip hanging off the end of your penis, and pinching it to remove any air bubbles, it's totally fine to ejaculate while you are inside a partner 's vagina, anus. Edit: Actually, even if he isn't that big I can feel it if he has a lot of propulsion power. . Thats because two condoms can be a pretty tight fit.
And so, a person should in theory only be able to put it on one way.