First, you both need to talk more about this...seriously talk, not bedroom talk. Make sure that your relationship is great, not just good, with an abundance of trust and communication. If at this point she is still interested, then you need to decide if you are looking for a MFM, FMF, or couple to fulfill your fantasy. If you want a couple and to do this on a vacation, we would suggest Desire in Cancun, but don't go EXPECTING anything to happen (that's the best way to ruin a vacation). Expect to have fun and know that there is a chance that more could happen (and it very likely will, just don't put pressure on either of you by trying to force it to happen). If you want a MFM...well you can find that just about anywhere (single men looking for women and/or couples in the L/S are as common as cheeseburgers at McDonalds). Throw a rock and you will find one (usually by signing up on a lifestyle website...see Find Swingers at top of page). If it is a FMF you are looking for, there's a reason single women in the L/S are known as unicorns. Good luck and let us know what you are looking for and how things progress.