I was wondering if there is another way of having sex with me on top.. the problem is my boyfriend "size" is quite large.. and when im on top it seems like its impossible to do it that way..cause he is so large it feels like there is no movement.. and we have tried it with lots of lube and just wont work.. so is there another postion of me on top that we could use, cause both of us love the position but just cant make it work? please help