Take a flyer
“Flyers” being shoes, this is “dressed, or without going to bed.”

Green gown
Giving a girl a green gown can only happen in the grass.

Lobster kettle
A woman who sleeps with soldiers coming in at port is said to “make a lobster kettle” of herself.

Convivial society
Similar to “amorous congress” in that this was a gentler term suitable for even the noble classes to use, even if they only whispered it.

St. George
In the story of St. George and the Dragon, the dragon reared up from the lake to tower over the saint. “Playing at St. George” casts a woman as the dragon and puts her on top.

Via The Week with the full list to refine your reprobative skills.