Last but not least... the final scenario: (first read Economics of Sex 101)
You are in a monogamous relationship and using a non-barrier contraceptive ONLY. Your partner cheats ONE SINGLE TIME, with only a non-barrier contraceptive being used (in the cheating incident).
Cost of sex skyrockets to:
7*0.7+ (0.003*0.982*0.2*300000) + 0.85*(0.102*0.85*350000) + 0.01*(0.12*0.01*2200000)
= $26,001.30
Wow.
Isn't math great?
Happy Valentine's, folks.