I must admit to being a little dubious about this product, how useful it might be and whether it would truly add anything other than titillation to my games. But I was pleasantly surprised. It deals with the topic tastefully (even the silhouette images are evocative but not outrageous) and presents a great new type of magic. I really liked the feel of the "Roses" (or spells) that sex magic can create - to me they had a kind of fairytale quality, allowing the caster to "curse" a target or cause them to become infatuated with a subject. The effects of the spells at first seems a little at odds with the way in which they are powered, but it just feels "right". I am not going to comment on the d20 class, as I don't play d20 games that often these days and I don't think my opinion would be that valid. The "mechanical" elements of the magic power and spells are pretty story-focused and don't have a lot of mechanical crunch to them, which I like but I am not sure how well this will mesh with other types of games. Overall, I like this a lot.
[4 of 5 Stars!]