When i was with my girlfrind, she was the frist and only girl i have ever been with, she didnt mind my period at all. I didnt want to not have sex on my period, i still get horny, and yes i feel fat and dont think the blood is something she wanted to see/feel. But like Downtown Amber said, we just threw down a towel and went for it. Now let me clear it up, she didnt go down on me while i was on my period, she just did other things. I never really looked at the mess i made (er sounds gross) we would just hop in the shower afterwards and clean up.