I didn't even know Rihanna had a blog. But now that she's the competition, I feel a little more hesitant to endorse her various stages of nekkidness on camera, including shooting covered topless teasy videos for her blog. I mean, I could do that kind of cheap stunting if I wanted to, though I'm highly doubting you'd want to see the results.
So, edge to Rihanna on that front. There's certain advantages women will always have, but so long as they lead to more exhibitionist videos and photos, I suppose we men can live with that inequality. Enjoy.