^^This person's critique is even more laughable, because it ignores reality.
It's just a fact that most people are not very good at sex during their first time. Rather than acting like Amber is the devil incarnate for not being that enthused about clumsy sex, one should commend her for faking an orgasm to make her girlfriend feel good about herself. And I 100% agree with Amber, kissing after she just ate you out is pretty revolting. I think that sex scene was probably the most "real" lesbian experience I've read in ages back then.
And as Lilliwyt said, it's just one optional scene that doesn't reflect on the rest of the game. Heck, Amber was in a pretty bad state of mind during most of the story, so a bit more empathy would go a long way.