Yo luke, first off, that guy is right, if she's gonna make eye contact, give her a sexual smile.
Secondly man, gunwitch is alot easier to sum up than to read thoroughly (or you could just read his post). It's about being natural. You see a woman, you think she's hot, you think about what you could do to her, and go approach her. The sexual state thing isn't thinking "alright go into sexual state" it should be natural. I mean for example, yesteday some older lady was literally staring at me as I was walking out of the office in her car (not older like grandma, but like a mother probably), and I looked back and smiled and was kinda fumbling with these books, and she's smiling and laughing having fun seeing me mess around, and I just smiled back, and I realized that the light was green and she was like 20 feet away from the light just staring at me, totally unaware that the light was green. This was all sexual, the laughing, smiling, eye contact, all very "intimate" if you could call it that, it's a natural process for a human to see another desirable person and look and be happy.
It's so simple man.
See girl.
Embrace sexuality
Talk.
The main part is being comfortable with your sexuality, which is the half good part about your OR, you worked actively on shutting down those mental processes that said it was bad, keep doing that, BUT DONT FOLLOW HER AROUND, that seemed pretty ****ing weird man, I'm not gonna lie lmao, following her from behind and trying to get horny really sounds like stalkerish/rapist, and actually it's got me laughing picturing a guy walking behind a woman and trying his hardest to become sexual LMAO. Good job though man, at least you are working on shutting down those "it's bad to think about sex" thoughts. Keepdoing that and actually approach.
P.S. Luke, I really don't approach that often, and you wouldn't have to either if you had a large social circle man, like I've got so many friends that I meet there friends who are girls and **** and I end up hitting it off more than enough to not have to go out and actively approach just to meet women, so I mean if you are that terrified than your only alternative is to meet a ton of people become really close friends, and then **** people outside of your social circle that you meet through your social circle.