Frosty Knickers

A person who is sexually frigid and unlikely to be sexual, even with a reasonable partnership match.
Frosty - as in barren, frigid, unfertile, too cold to show any signs of life in there/unwilling to have any life in those knickers/panties under any circumstances. Frosted over so as to be immovable to allow access to what is clothed by the knickers/panties.
Not to beconfused with voluntary or enforce chasticy, Incel, celebacy, sapiosexual or demisexual.

"That person has Frosty Knickers/Panties - they resist any kind of sexual talk or respectful approaches because they're irrationally oppositional to having sex with their perfect Partner who they would otherwise find highly sexually attractive."
"Damn girl! Have you got Frosty Knickers now you've got me into your bedroom, I thought you were joking about looking at your etchings."