If you want something that implies finding a soulmate (regardless of the sexual orientation of the couple) here's a suggestion: How about something like the Two of Cups in the Waite deck (not necessarily holding the cups) but with both figures backlit so they appear in silhouette, their sex undiscernable. That way the viewer can simply read it as a loving couple, regardless of sexual affinity. I never thought of the card as being strictly heterosexual (whether that's because I'm a hetero male or because I was simply associating the card with an abstract concept I'm not sure) but I can see where some might find the card not pictorially representative of their lovelife. It might take some doing to get the figures "androgynous" enough, but if you dress them appropriately you might not be able to tell the boys from the girls :) (If you happen to have the Sheridan/Douglas deck, compare their Two of Cups, it's similar to my idea but the figures' sexes are obvious)