Classy way of referring to sexual intercourse. Most often used when inviting a woman back to your home.
While this phrase generally refers to any type of sex act, it is sometimes used to refer specifically to sex in an outdoor hot tub.
Variations: If used when referring specifically to outdoor hot tub sex and the sex happens to be anal, then the term is modified as "Exotic Garden Party"
Would you like to come back to my place for a Luxury Garden Party?
We are inviting the four Japanese students to a Luxury Garden Party.
I took her home and we had an Exotic Garden Party