What you're after may be that in Pills to Purge Melancholy (1719), V.126, called there simply "A Song: Set by Mr. Clarke", thus:

Young Coridon and Phillis
Sate in a lovely Grove;
Contriving Crowns of Lillies,
Repeating Tales of Love:
And something else, but what I dare not [name].

But as they were a Playing,
, She oagled so the Swain;
It sav'd her plainly saying,
Let's kiss to ease our Pain;
And something else, &c.

A thousand times he kiss'd her,
Laying her on the green:
But as he farther press'd her,
Her pretty Leg was seen:
And something else, &c.

So many Beauties removing,
His Ardour still increas'd
And greater Joys pursuing,
He wander'd o'er her Breast:
And something else, &c.

A last Effort she trying,
His Passion to withstand;
Cry'd, but it was faintly crying,
Pray take away your Hand:
And something else, &c.

Young Coridon grown bolder,
The Minute would improve;
This is the Time he told her,
To shew you how I love;
And something else, &c.

The Nymph seem'd almost dying,
Dissolv'd in amorous Heat;
She kiss'd, and told him sighing,
My Dear your Love is great:
And something else, &c.

But Phillis did recover
Much sooner than the Swain;
She blushing ask'd her Lover,
Shall we not Kiss again:
And something else, &c.

Thus Love his Revels keeping,
'Till Nature at a stand;
From talk they fell to Sleeping,
Holding each others Hand;
And something else, &c.

This has been attributed to Sedley, and appears in its "real" form [says Legman, Horn Book p. 195]in 1730, minus the "leering refrain". One can doubt this; I can see how the "harmless pastoral" makes sense and all that by itself, but it is obviously crafted to be ambiguous right there, and this had to be done first. Anyway, I hope this is what you're after.