It's nothing to do with being perfect Jan1957, it's about whether you think IVF is something that should be paid for on the NHS.
As it stands most of the fertility problems I deal with are not to do with people who have been sick and as a result are now infertile, the majority just can not concieve naturally and want to have their own child. That's absolutely fine, go for it but pay for it yourself. Or you can take part in an exchange scheme as well (you donate eggs to another woman and in turn get half your IVF funded I think). I've no problems with this but I don't think it's necessary. Unlike the gender re-assigment, it does not fall under mental health guidelines. It's jut because people want to have their 'own' child.
As to the stress it puts on to marriages, well I do agree with that, I see it alot. But I think it's the sort of thing you discuss before getting married. I've discussed it with ex boyfirends in the past. One absolutely didn't want kids, the other did but knew that it might not happen but that I was willing to be tested if it was going to be a deal breaker for him. It wasn't a deal breaker so I didn't get tested.