well i think my thread called "Virtue" might be kinda helpful....
i had just recently added a new post talking about does it cheapen one's submission if they give it to several Doms?
i stand with everyone else. As long as your completely honest and willing to communicate things shouldn't go wrong. Obvisously not everyone agrees it's ok to date more than one person at a time, but other's do. So it's just a matter of finding out everyone that is involved opinions and going from there.
Same for sex or sexual play. You just need to be honest and open and realize that what's ok by you may not be ok by the person you are interested in. And always be safe as possible.