One Roommate has sex while the other is supposedly sleeping

Problem : One Roommate has sex while the other is supposedly sleeping. That is generally happens with young age 18 to 25 years boys and girls. 

Why this happens :

Roommate-A create circumstances that all his/her roommates are go somewhere so he/she can get whole room free. If this is not happens Roommate-B and Roommate-C don't want to go anywhere. So there is problem create and Roommate-A want room without anyone badly.

Roommate-A Offers :   
Give offer to Roommate-B and Roommate-C i.e.

1. Go and watch movies
2. Go to your friends room
3. Have you go anywhere for meeting
4. You have to go somewhere you tell me last week
5. You have to go to your relatives room
6. I can buy drinks for you 
7. For you dinner from my side 
8. Please go to Sutta point 
9. I can do all your work
10. I can wash your clothes 
11. One Girlfriends Number for you

  Conclusion : 

When all above offer's will be rejected by Roommate-B and Roommate-C then, Finally all three roommates are in the room and Girlfriends came to room and watch this then she say can we talk somewhere else for 5 min.

Girlfriend Says To Roommate-A (Boyfriend) :  

• What is that you told me no one is there we have fun. 
• I am not comfortable will all.
• I am going.
• We will meet somewhere else.
• You can not do anything for me.
• You spoil my whole night.

Roommate-A Say to His Girlfriend :   

• There is no problem.
• We will go to another room there is you and me.
• We lock the door.
• Please try to understand.
• I  offers so many things but they refuse all the things.
• Don't worry we have fun this night trust on me.

End :  Silent sex takes place no-one want to compromise. Tell me this is the situation what you have to do share your views and also some ideas conclusions so our Roommate-A, Roommate-B and Roommate-C have resolve there problem and feel good.