Sharing and exploring your  fantasies as a couple can take your sex lives to sizzling new heights. It can, however, be more easily said than done. "There needs to be a certain level of trust in a relationship for this kind of intimate exchange," says relationship expert Yvonne K Fulbright, Ph.D., author of Touch Me There! So if you're wondering how to go about sharing your hidden sexual fantasies or getting your guy to open up about his, here are some rules to broach the topic without risking embarrassment, judgment or jealousy.

Weigh the pros and cons

Before you open up about your fantasy, think about what divulging that information will accomplish. Of course, things that could offend your partner or make him feel inadequate (for example, a fantasy that involves your ex) are better left unsaid. "However, if you have a fantasy that you think he might be into too -- and it could add a fantastic alternative realm to your sex life -- maybe you should say something,"

Err on the tame side

"Start your discussion by sharing tamer fantasies, as these tend to be easier both to articulate and digest," adds Fulbright. "Just be sure to edit any details that may cause jealousy or trigger a misunderstanding." If he reacts positively, then you can work your way up to telling him your more risqué fantasies.

Do a reel-life test

If your fantasy is on the wild side, test the waters first. One way to find out how much your partner can handle is to rent a mainstream movie or DVD featuring your fantasy and gauge his reaction.

Exchange a list

Another way is to trade your fantasies. "First, make a list of all the things you'd never do. Then, make a list of things you'd like to try. Have your guy do the same. Then, compare your lists," says Linder. Anything on either of your "Would Never Do" lists is off the table. As for the things that appear on both of your "Like To Try" column, well, you know where to take it from there.