As a guy, I have used this solo and with my girlfriend. By myself, it feels really good and is able to add something different to your typical hand session. It starts slow, and then the heat comes in quickly. The heat wasn't terrible, but at the lube's maximum level of heat, I was ready to be done. Did I try it again? Yes. My girlfriend can be very sensitive, though, and it was not a winner with her. She was immediately turned off and in pain. Needless to say, our session was over.

The heat starts slow and then builds up very quickly. If put into words, it almost feels like an intense friction heat.

This is silicone-based so luckily a little goes a long way!