I can do the same thing. I have been able.to.domit for as long as I can remember. I can do it at will in any condition. Eyes open, closed, cold or hot. I don't have to think about it either. I just do it. I don't show to many people anymore. I have not personally met anyone else that can control the piloerection. Speaking of erection, it does give me a very pleasurable sensation everytime I do it. It's like a skin or bodygasm. It also feels like I am taking in the energy from around me and moving it through my body. I can transfer the bumps from one side to the other. Like the others I feel it in the back of my head and it expands to my frontal lobe and all over my whole body. It's an intense tingling/ vibration that moves through me like waves. I use it when praying to God. I also see the things I am praying for in my mind and push out my feelings/intent. Mostly I send been out feelings of love. Maybe I said to much. I don't know. I just know that most people are not able to do this and I wonder why. I have been hesitant to talk about it for fear of being poked and prodded or whatever. I am glad there are other people out there who have the same ability. I believe it's something to be looked into and more studies should be done. It's just odd to me that there isn't more people talking about this. There is just not enough info out there yet. I believe its definitely a special ability.