Would you bisexualize girlfriend/boyfriend?

Nearly every guy I know has tried to talk their girlfriend into a threeway with another girl, and especially to kiss/eat out/fuck another girl.

I know a few girls who want to (or have) gotten their boyfriends to try bi, but a lot of girls say they don't like the idea. My girlfriend says they are afraid to see it happen, but most all of them really fantasize about it.

I have more to add on this, including some cool stories, but I'll wait and see what kind of feedback I get from you guys.

Here are some specific questions (but I want to hear whatever you have to say on this):
---would you like to have the person you're dating have a bisexual experience?
---do you want to watch or participate?
---do you want it to be a one-time thing, or do you want to see them open up and really like it?
---what's hotter, having them do the same sex kiss, or same sex orgasm?
---is it hotter if they jump right in, or fight it a little first?
---would you, or have you, had this done to you?