This is why I'm saving money for a sex doll... There are some new out there very realist.
Both LTR or being single is the same amount of danger man. And you're completely right about STD's... I had some infections and took antibiotics, and those things literally interact not only with your physiology but with your mental health. When I took antibiotics my mind just got really weird, and I found some researched that link antibiotics with some mental disorders. So you have the STD consequences and also the medications side effects.
We're getting on a stage that LTR is not a solution to prevent STD anymore... There was a girl I used to ****, she started date a guy that works on my company (LTR), she just added me on facebook those days... I'm sure she want to contact me to **** her again (I just blocked her). Looked at her stories on instagram, a lot of pictures of her and his boyfriend around her "male friends". I feel sorry for him... so innocent. And also, a lot of guy I know had ****ed her... and it's a lottttt of guys in my town.
I can only imagine ONE great solution for this: improve investments on AI... create some AI realistic dolls (already exist some prototypes). And a scientist should find a way to link VR with human senses. Idk if you watched star trek, they should try to create something like holodeck.
Or even, find a way or technology to help induce lucid dreams... so you can imagine and create everything you want.
It's crazy? No... based on our reality, this is the best thing to please our sexual desire on a healthy way (STD's). And it should be done really quickly, before people start killing themselves.
If my actual projects gave me money, my next step will be go deep into AI and invest on those things (graduated on science computing). This is the best future investment someone could make.
And this is the best quality of humans... the ability to create crazy and awesome stuffs.