Is it normal that my boyfriend whats me to kick him in the nuts?

Ok I went over to my boyfriend's house this weekend and while his mom was there he acted normal.But after she left and we were alone, he went up to his room, came down wearing light basketball shorts,and also that day I was wearing some high heels and I had my heels off and he told me if I could put on my high heels and kick him in the balls as hard as I could.I love him so I disainfully did it. since then he asked if I could kick him in the balls and to wear something sexy and and put on some high heels. and so I'm actually starting to like it but, Is it Normal?