My girlfriend and I had this discuission about 6 or so months into our relationship, she is bisexual (bi-curious, whatever you want to call ie) and we openly talk about girls we like and see around our town. We talked alot about bringing a girl in for a night of fun, she had never did anything but kiss a girl on a dare, but she was really insterested in a female counterpart. I have nothing against being with just my baby (you're so cute scarebearjinx
so I left the final disicion up to her, we laid down ground rules, talked about what could and couldn't be done. We met a girl through a friend and ended up letting her spend the night at my place. It was fun, but a little weird, we had a long talk after she left and discussed how we felt, all and all we communicated enugh to get our feelings across and we have no regrets about it. I think the most important thing to get across is that both of you want to stay together with each other, not the people who come from the outside. Just talk, ALOT think about every possible thing that comes to your mind about it, like many said before, communication is the KEY. If you're worried in the least bit about it killing your marriage, don't do it, it could do that and worse
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As for S.T.Ds Condoms were used and we got tested later after all was done. Clean bill of health (except for the smoking a pack a day, stress, and bong hits, but that's beside the point).