Is your mind in the gutter? If so, get out because I need more room.
This cocktail dates back to Prohibition, when many people flaunted the official (but not necessarily prevailing) social norms. Here's how you make this potentially libido enhancing cocktail:
.75 ounces light rum
.75 ounces brandy
.75 ounces Cointreau
juice from 1/4 a lemon
Combine in a shaker with ice, shake like you're (do I really need to complete this sentence?), and strain into a chilled cocktail glass.
Once you've finished (pun intended), you might notice this cocktail is closely related to a Sidecar. The Between The Sheets essentially cuts the brandy or cognac in a Sidecar with light rum. If the end result is too tart, you can adjust the proportions of the liquors, or you can add a dash of super simple syrup. Similarly, if you want a slightly different flavor, use dark rum instead of light rum.
Side effects may include delayed headache, inflated view of one's attractiveness, and loss of indoor voice. If you experience intoxication lasting more than four hours, stop drinking.