No, the MC and the player doesn't think anything. They know what they are from the start beacuse they are not treated like idiots, they don't need useless info rubbed in their faces that they can be inferred on their own.
If there is a mom in the game, you don't need to see how the kid was conceived, or be told how many others have creampied her before, or after the kid was born to know she is not a virgin.
If a girl says she likes doing it in a sex position, you understand she is experienced, you don't need to show, or hear her reminisce about how many times she has been fucked in that position.
You don't need a girl you met at a gloryhole to talk about previous clients, or read her thoughts comparing dick tastes to know that she is promiscuous.
If there is a stripper that does anal in the first meeting with the MC, you can infer she must have done that with others as well, you don't need it spelled out for you.
...unless you are making a cuck game, where them being portrayed as ultra massive whores and those details are the goal.
Bottom line, their games don't insult players intelligence with loopholes and technicalities, thats why you don't see people scream about NTR there even if threads are huge. You would think that would be hint enough that its not about players wanting virgins, but then again I doubt that they are coming into the topic in good faith, or otherwise they would be transparent about the content of their games from the get-go.