ATOM RPG

In the city of Krasnoznamenny there is a barge; on the barge there is a casino and a brothel. General Protivnoff will meet you in the brothel and after a dialogue he will drag you into the rooms, and then a prostitute will appear in the hall, you can also negotiate sex with her, after which she will also draw the location of one stash on the map. After these two attempts, the trophy will be given.
You can still seduce some characters while completing quests, but if you just need a trophy, then the option described above is the fastest and in one place.