What is Tain't?
1.
Vulgar term for the perineum, the area of skin rich in nerve endings that is located below the anus (the opening for bowel movements). For women, the perineum extends to the vaginal opening; for men it extends to the base of the testicles.
Because the perineum is so rich in nerve endings it often feels pleasing to have it touched or stroked. If one is comfortable with being touched on the perineum, its stimulation can be incorporated into a couple's lovemaking to further enhance sexual arousal.
To make stimulation smoother and more comfortable, it is often helpful to lubricate your fingers before stroking the perineum during lovemaking.
As long as the stimulation remains outside the body on the perineum, any type of lubricant (petroleum-base or water-base) will do.
However, because this kind of stimulation is often associated with insertion of the finger into the vagina or anus, or both, a water-base lubricant is recommended and preferred.
My tain't? One hundred percent pure bacon!
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2.
bit between a lady's cuckoo and her poopoo. (see Barse)
It Tain't arse and it Tain't 'gina. (see Barse)
3.
The stretch of skin joining two legs.
Tain't pink and tain't stink.
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4.
First off, not found on a woman. The Tain't is the part between the man's balls and his asshole and is said to be extremely sensitive during and right after ejaculation. Duh.
Baby, please push on my Tain't when you do that. Please.