With all due respect, I would suggest any arrangements for this are kept exceptionally hush hush.
Not only is there a security risk for all concerned with too much being posted in a public forum, but it frankly comes across as a form of touting. If you want a 3 way with the lass, I'm sure she could make discreet enquiries on your behalf. This has all the hallmarks of a car crash waiting to happen IMO.