I think it's in season 9. Monica and Chandler were babysitting Emma they wanted to have sex but couldn't do it in front of Emma and neither could leave Emma alone.
Monica said she didn't care if she did it in front of a baby and Chandler told her she didn't want to do it in front of a deer.
When Joey entered and found them in the room while Emma is outside in her crib he took her.
Monica said she didn't care if she did it in front of a baby and Chandler told her she didn't want to do it in front of a deer.
When Joey entered and found them in the room while Emma is outside in her crib he took her.