Masturbating in front of your spouse

So my husband and I have been married for 2 years, together for almost 7. We had an IUI done this month, which means he had to put his specimen in a cup prior to the IUI. He was having trouble getting it done (this was at our house, it's only 5 minutes from the clinic so he can do it in his own home). So I asked him how I could help. He said, "can I watch you play with yourself?" At the moment I was thinking, I need this done in the next 30 minutes so I will do whatever. So he watched me play with myself and he came within 5 minutes. Surprisingly, seeing how turned on he got from watching me seriously turned me on. Does anyone else do this? I didn't think I would like it but I'm seriously surprised because it turned me on too. Does anyone else do this with their man?