Hi DRR! Thankyou for reporting a bug.
There are a few types of interactions using the [Interact] key (Typically E/F) in the game so far:
• Doors
• Talking to NPCs
• Open Chests
• Initiate a sex scene (Training stage only)
Are you referring to trying to initiate sex scenes outside of the training stage? That hasn't been implemented into normal gameplay yet since it requires more player dom animations.