You are fine, you are not hurting yourself or anybody else. If it feels good. DO IT. I do and have been for 34 years. I love doing it when I am not with my gal, if she is at work and I need a release... I grab a few of my older down pillows and grab some KY or warm up some hand cream and to to town, No biggie Rock on .... You are not hurting you or anybody. DO IT
I would love to have a gal in my life that can do that.