The one hole that is still virginal and hasnt been penetrated, usually for females its the anus. This allows you to still wear white on yer wedding day and ensures your mate they have something to look foward to.
What you call a womans vagina when she uses it for the act of welcoming any and all good-looking new members into your community by sleeping with them before anyone else does. Similer to a welcome wagon but going the extra mile to your bed.
1-they call me the welcome mat because i hunt down the new guy in town and drag him to my lair before anyone else gets in theier pants
2- that chick is alameda's welcome mat for when the coasties pull into town