Hey. What you're explaining won't work in a clean direct test, as Sims pick things randomly. This means that you will see them talk to any Sim and potentially create a romantic relationship. In a long-term test, these Sims should talk more often to the ones they find the most attractive, and the least to the ones they don't find attractive. If you were to collect the results for a longer period of time, you should see that being the case. Realistically though, they will talk to however they want, so that the game can actually still work.
I don't know of any such nasty stuff you're asking me about. This is a family friendly environment.