I tend to think both Wolf and Skirabbit are on to something, here. While one can conjecture endlessly over the possible detriments of engaging in threeway encounters, those concerns are only realized or dispelled after you've "rolled the dice," so to speak. And, of course, it really is a gamble. You can't know with any certainty how you or your partner will feel. But it's my opinion that, regardless of the outcome, the gamble pays off precisely because you now have the opportunity to learn something new about yourself. Why are you feeling jealous? Is it a "penis thing"? Are you frightened of being humiliated? Are you scared that you are opening a pandora's box of unpredictable sexual behavior? In the end, I think you two are quite right. These sorts of questions aren't answered until afterwards. You won't know until you know. But what I'm getting at *here* is that the emotional associations you've established with threeway sex -- be it disgust, anxiety, or interest and excitation -- can be remarkable learning tools. We North Americans often fail to make use of these tools because we aren't very reflective people. If you're disgusted, inquire into your disgust. If you're interested in threesomes, then why are you interested? How will engaging in threeway sex serve your relationship? How will it bring you and your partner closer together?
In these kinds of chat forums, the vaguely implied (but seemingly unanswerable) question is "should you have a threesome or not?" But I don't think that's an interesting question, and I don't think there's a useful answer either. *My point* is that threesomes are ideal activities for drawing on our emotional resources as learning tools, because they tend to raise so many intense feelings in people. So, in the spirit of learning, perhaps I can end with a few questions rather than a definitive answer....
Those of you considering a threesome, try asking yourselves the following questions: Ask, "What do I expect to gain here by participating in a threesome?" Will it deepen my relationship? My marriage? Do I want to share our love with another person? Why? Do I want to explore another person's body? Is there an element of abuse? Do I want to watch my wife defile herself? Do I want to be defiled?
If you ask these sorts of questions -- that is, questions pertaining to actual "feel" your desires have, rather than asking "is it right or wrong?" questions -- you can learn more about yourself as an idiosyncratic sexual entity. You'll also be able to communicate more clearly with your partner on why you want (or don't want) to engage in a threesome with them.
Similarly, if you are digusted at the idea of threeway encounters, inquire into the nature of your disgust. Visualize the disgusting act. What disgusts you about it? How does it disgust you? Where in your body do you feel your disgust? If you ask these sorts of feeling-oriented questions, rather than simply falling back into the religious and ethical beliefs you've acquired from your community, you can get closer to the heart of the matter. You can really start to understand not only *what* you want, but *why* you want it. And isn't that the point of sexual exploration? To pursue greater and more glorious heights of (mutual?) satisfaction?