I have mine separate, but I do a lot of reviewing. My personal blog entries were getting swallowed and overwhelmed by my reviews and I didn't want that. So, since I'm hosted now (yay!) I created a separate blog for my reviews and now my personal entries don't get pushed out of the way and overwhelmed by my reviews.
Also - do you think you will have readers who won't want to see your sex toy reviews? That's something else to think about. I'm pretty sure I do, so along with keeping my ocd happy
I am also doing a favor to those readers who don't want to see my toy reviews.
In the end it's a personal choice though. Do what works best for you.