If its a 5 star and in DC, they'll be used to it. Otherwise, use the search function here, it works great

If you are looking for non-sensual massage, by all means ask the concierge, but keep a few things in mind.  The concierge will call the person who gives them the biggest piece of the action, not necessarily the best massage therapist who comes a-calling.

Marriott (which includes Ritz) banned in-room massage referrals by staff after the CraigsList fiasco in Boston, though one had nothing to do with the other.

If you are looking for a TER massage, search here, don't involve the concierge.