Is parenthood a right or privilege?

Tough question, and one for which I don't have an answer. John Reid clearly believes that the chance of being a parent is a right, although one round of IVF treatment will only have a positive result in 25% of cases. But should the NHS even be providing this treatment? £75 million doesn't sound a lot when compared to the total NHS budget, but it is still a considerable sum, and with the success rate being so low, is a pretty poor return on investment in purely financial terms.