From further up thread...
"Legally speaking it would most likely not be a rape, as the penetration was consensual.
Morally it is fucking vile and disgusting to put your semen inside a woman who has said she does not want you to ejaculate inside her. That man is placing her at risk of unwanted pregnancy and infections. And it is just wrong to betray someone's trust when you have agreed on the contraception you will use.
I do not think that sort of deception is in any way excusable. BUT, the woman could have checked about the use/non use of the condom and then withdrawn her consent when she saw that the penis did not have a condom on it. If he proceeded anyway, of course that is rape.
What sort of man would agree to use a condom and then not use it or take it off when she wasn't aware? Why would you do that? Surely the risk of having an unwanted child and 18 years of csa payments would put most of them off?
It isn't quite the same if the condom discussion took place at a different time to the actual sex. Many people who use condoms for contraception have got carried away in the heat of the moment. That is the fault of both partners if they forget contraception, not just the man. But if he said right before sex "yes of course I will put a condom on" and then tricked her into having unprotected sex, that is abominable behaviour and, IMO, ought to be a criminal offence."
I agree with this