Wow... yes I agree about it looking like a sign for the devil. That's not the intention. How about like the first one below. Odviously again done better than my quick paint sketch. The idea is to be a little suggestive to guys that kind of know about hot wives or cuckolding, but not totally odvious to everyone else. She could probably tell people that one was a cross and she just liked the arrows for people she didn't want to know.
The vine will be similar to the middle picture below, without the words of course with butterflys and flowers on the vine, but it will be lower like in the third picture. The idea once again is to look kind of like an anklet. Once again be suggestive, but not all out saying it, since we all know anklets are kind of a sign, but lots of other people wear them too.
Thank you guys, you've helped a LOT.