There's a few people on this thread that should actually go and read the NICE guidelines before throwing in their two pennorth. There's no suggestion that fertile lesbians get given priority for IVF over heterosexuals with a clinical need, just that sexuality shouldn't bar someone from accessing NHS IVF (as it does now).
When I was having fertility problems I thought at one stage I might be going through early menopause. I asked my GP to do some blood tests to check. He said no, he didn't agree with helping lesbians to get pregnant. I said I wasn't asking him to get me pregnant, just check what was going on with these symptoms as I feared they might mean either premature menopause or even ovarian cancer. He said he wouldn't help but would refer to the fertility service at the local hospital. They refused to even see me, on the grounds that I am a lesbian.
It turned out that, rather than refer me for investigation of symptoms, my GP had written I was a lesbian who wanted help getting pregnant. (In fact, I was clear I wasn't going to go the IVF route - it was definitely investigation I wanted, not treatment.) So the hospital refused to see me, because they were entitled to refuse treatment to lesbians.
I was stuck in the position where I had clinical symptoms that needed investigating, and no medical professional would even take a clinical history or talk to me about what might be going on. THAT is the sort of situation that should be changed by these guidelines.
Oh, and klaxon blaring for the inevitable appearance on this thread of the 'they should adopt' comment. I truly think that no-one should be allowed to say this unless they have adopted at least one child themselves. It is such a daft and insensitive thing to say and I've never met an adoptive parent who would say it.