A casual sex partner who is available while the kids are at school, for single parents.
Or
A casual sex partner who is available during business hours.
~M. Graves
"I can't go out at night, I need a daytimer so I can get laid while the kids are at school.
Romantic feelings you shouldn't have, for someone you shouldn't have them for, (usually a casual sex partner or friend.)
Catching heart herpes. herpes of the heart.
"I caught heart herpes for my friend with benefits."
"It's all fun and games til you catch heart herpes."