Masturbation After Sex at 19 -- How strange is this?

[MasterShakes]

I have never told anybody else about this in my life. I want to know how odd this is. I'll keep this as short as possible. Every statement below is absolutely true.

I am a straight male.

Though I was an extremely horny teenager, I never masturbated TO COMPLETION until I was 19 years old.

I had sex for the first time at age 18, lasted over an hour before stopping, and never had sex to completion until I had sex with the same girl for the third time.

I don't think I have ever experienced "blue balls".

I have had a completely healthy, active sexual existence ever since. I am now 27.

Edit: All I can say as far as an explanation goes is that I just didn't know how to get there. When it finally happened for the first time, it was a complete shock.