Once you have enough capital and skillful workers, build a brothel in your home.
It has graphics, and a large community of members, offering you a vast and diverse adult virtual reality game.
The next generation of adult content games saw the likes of Playboy Mansion.
In more mainstream games like Grand Theft Auto, sex soon started to become more ‘normal’.
may not have been the first dating sim done in 3D graphics, thought I don’t know of any that predate it, and I wasn’t influenced by any.
It is even possible that it is not the first dating sim with one character and in 3D, but it was the first to gain popularity, and directly or indirectly inspire dozens of similar games, mostly by independent creators like myself.