Oh, I get it, Polly. I wouldn't have tricked a person. Just my own feelings, but I'd have gone it alone or other arrangements (such as co-parenting with a gay male couple or co-parenting in a platonic setting if one or the other could be had). I can see the desperation, I experienced it myself.
'I am staggered at the number of people who seem to think this ok.'
I am, too. You do get a lot of responses, however, if a woman posts on here that she is in her mid-thirties and wanting children, that she has time and lots of anecdotes about easily conceiving healthy children in the late-30s or early-40s and I always take those with a grain of salt because, I am 46 now, I have a number of friends who have experienced infertility at such ages and the outcome wasn't like that.
I was 28 when I'd have enough of hormonal contraception. I wanted a child, and was married, but I told my spouse that I was quitting contraception. For 2 years, he used a condom. We sought counselling, to work through our respective feelings, and ultimately, when I was 30, we divorced. But I wouldn't have tricked him. I loved him and he is a good person (I'm still in contact with him now, DH is, too, he is now 50 and has no children by choice, he had a vasectomy after we divorced) and he, equally, loved me and would not want to keep me from at least trying.
To me, love is respect and respect is love, and I couldn't bring myself to be dishonest with anyone I loved about something so serious (okay, I concealed surprise trips or meals at restaurants for special occasions for those I knew enjoyed surprises, but you know what I mean. If you've got to the point where you can't speak to someone you love about life like that, you have no business being with them, much less procreating with them. But I realise that's my opinion and it appears plenty of people think this is an okay thing to do.