I have a friend (yes) who has been going out with a lady for about a year. He really likes her and would like to continue the relationship, but ...
she is knocking against biological clock time and keeps saying she wants kids before it's too late. He umms and aahs and changes the subject. In truth he doesn't want kids, but he doesn't want to give up seeing this lady.
So, is he a selfish bastard, or is all fair in love and war? Should he tell her straight out that he doesn't want kids, full stop, or leave her to figure it out and do what's best for her.

