When a women's vagina is very very loose, it is said to be 'gapped out'.
This is sometimes the result of genetics, however, it is much more commonly associated with whore-ish behavior; slutting around like a hoebag, banging dudes like a dirtleg, getting blown up like The House of a Thousand Cocks, etc.
The gapped out woman may have trouble keeping tampons inserted, or may be unable to tell 'if it is in yet'.
When a woman has been fucked with something so enormous (e.g. a Dragon dildo, or any variant of a Big Dick such as a BWC or a BBC) that her pussy can't return to it's previous tightness. This is where the phrase,"once you go black you'll never go back" comes from. It's not about race so much as it's about grinding the walls of your vagina down until it's like a fleshy, 16th century smoothbore cannon that can fire out ping pong balls with ease. As they say, "Burn the coal, pay the toll." Similarly, while the sensitivity may return, some women who have become mothers will say, "It just isn't the same," after they've had kids. That's because they've pushed something between the size of a brick to a cinder block out of the ol' roastie.