Compatability ???

People often ask me in the SE&X course things like:
How do you bring up a topic about sexuality with your partner(s)?
How can I talk about sexual compatability?
As far as I am concerened discussing anything with people depends on your level of comfort, knowledge,feelings, who the person is, what environment you are in etcetc.

Here is a link for those of you who are interested from about.com: sexuality regarding 'sexual' combatability. have a look around? What are youre thoughts??