You have heard of showers I take it...rules the whole thing works on quite rigid rules.
Rules like
1. Showering
2. Never come back to our place always go to theirs.
3. Always preschedule what days you are going to see the other person and tell the partner.
4. Never more than once a week max unless going on pull for new lover.
5 Only one lover at a time.
6 If love even begins to enter your head or theirs terminate the relationship immediately and find new lover.
Sensible stuff really.