I find this thread odd really. There seems to be an awful lot of assumption that even if there is a real chance that the baby is not his, the man should just shut up and get on with it, and he is some kind of nasty bastard if he doesn't. In circumstances where a woman has covered up an affair or mistakenly attributed paternity to a specific man, and her partner brings up a child as his own for 15 years and then finds out, he would usually feel an emotion not unlike a bereavement of sorts - it would be devastating.
I wonder how different the responses here would be if it was the woman who wanted DNA testing? Let's say she had been casually dating two or three men over a period of a few weeks and genuinely didn't know who the father of an unplanned baby was, and she came on here saying 'AIBU to expect all three of them to take paternity tests so I can pin one of them down to do the decent thing by his child? None of them are willing to do it - are they all selfish wankers, avoiding their responsibility?'
I think she'd get a resounding yes, to be honest. And yet how is that different to the hypothetical woman being defended on this thread who doesn't see why the man should have a right to ask for a DNA test, or question the validity of what she says? He should just believe her when she says 'you are the father.' Why do these things only ever work one way? Of course 99% of the time there will be no doubt to start with, but I dislike the assumption from some of you on here that the woman has the right to know for sure, but the man does not.
Well there are plenty of fab men who are KNOWINGLY bringing up another man's child so I would be offended if the implication was that if the kid wasn't his then he wouldn't bother.
As an adoptee, I find it quite disgusting that a man should only be expected to raise his blood child.
IMO men should get the fuck over it and understand that it's not just spunking that makes a father.



Of course plenty of men knowingly and willingly bring up someone else's child (as do plenty of women) but surely that should be a circumstance based on choice and acceptance, not lies or evasiveness?
Imagine you were given the wrong baby to take home from the maternity ward and you felt something was not right so after a few days you queried it and were told 'what does it matter? You've got that baby now. Just keep that one and stop making a fuss.' 
I see no reason why DNA should not be taken as a matter of course at birth, on every baby whether its parentage is in doubt or not. It just negates the need for long protracted arguments and denials and court battles and accusations and heartache futher down the road.
Having said all that, I can understand why the OP feels angry at her OH's comments, but only if she is feeling personally mistrusted by him - I see no problem with his thoughts in a general sense.