[Rated PG] How do you determine your sexual/sensual ethics and boundaries?

[This discussion is Rated PG.  I ask responses be suitable for a general audience.]

When I think of my sexual/sensual ethics and boundaries, I think in terms of mutual respect, preventing harm to self/other, honoring my spiritual/moral belief system, and the practice of pleasure.  I do not believe in operating from a shame-based system. I think human sexuality is a beautiful gift and experience. Yet, I think everything has its place and some things need to be evaluated critically.

We each have our own value systems for evaluating sexual/sensual ethics and boundaries.  How do you determine your limits and practices? How does this affect how you perceive/judge the limits and practices of others?