Nothing kills the mood faster than looking down between you and your partner's sweaty bodies during (or after) sex only to discover the condom broke, fell off or went MIA. Any one of these situations opens the door to drugstore dashes, unplanned pregnancies and unwanted sexually transmitted infections, and needs to be dealt with ASAP.

The most important thing to keep in mind: If there's even the possibility of pre-ejaculate or ejaculate in the picture, the woman is going to want to down emergency contraception (aka the morning-after pill) as soon as possible. If a condom isn't being used effectively, then you aren't getting the protection you need to prevent pregnancy, said Amy Roskin, M.D., medical director and head of clinical operations at telemedicine provider The Pill Club. "You don't even need to wait until the morning after to use emergency contraception," she added. "It's more effective the sooner you take it after unprotected sex."

If you're not sure of your partner's status, you'll