3. Scratching his back – To be honest, this can be really good thing, and a lot of guys like it. But, be carefull, as scratching his back can be really painfull. I know it is hard to think when you are in the middle of having really passinate sex , but you have to. Or cut your nails. So, unless he really likes that, pay attention how you’re using your nails. Don’t make noodles out of his back. Also, making him bleed – not sexy.