Alright yes this is a satire sub but I don't mind trying to explain things to people who are honestly willing to listen and give it a chance.

I did miss out on sex on high school, and I want to make up for it.

First of all no amount of sex you have now will "make up" for the sex you think you missed out on in highschool. You are chasing something that has already passed. I know for a fact you will be having better quality sex now than any "cool kid" highschooler is.

So would using red pill actually be useful to a guy like me, who loves sex, and just wants to checkout the casual sex market?

In some sense yes but mostly no. TRP does have some nice advice about simple flirting techniques. For example, Kino, or light touching while flirting, is pretty much a universally accepted thing in the world. Having an "abundance mentality" is good because you should focus on those who do find you attractive not those who reject you. And yes, I would always suggest people who want to improve their self image start working out, that good advice for anyone.

However, those small flirting tips are really the only useful information that they having. All their talk about "false rape claims", "LMR", "AWALT", and other shit will only hurt you.

Im around your age and feel like I've been pretty successful when it comes to dating and relationships. The best thing that helped me was learning how to have honest conversations about your life and what you are looking for.