5) Say "no" to quid pro quo. Sometimes life isn't fair, just because someone sends you a photo of their "stuff" doesn't mean you have to reciprocate OR use your real photo (see previous point). Extra hilarity points if you return the pic of a different ethnicity, gender or species than of you yourself.
6) Examine your goals. Are you seeking to enflame passion in a future sex partner? This mayn't do the trick and they'll probably show it to friends. Are you looking to entice a current or former sex partner? They may have a limited memory of your abilities if this is necessary and they'll probably show it to friends... Are you trying to "freak out the normals"? If so, the normals should probably take your phone away.
7) This will get out. Crotch shots are a gateway drug. One of these days, you'll become too-too emboldened and that's when you slip up. Or some scandal-ass [sic] ex will seek revenge through publishing your baby-making/feeding parts. Please keep this in mind before you click and send.
So that's it. More or less, only send junk pictures to people who really want them and be wary of people who really want them. Feel free to send in your own junk-emailing triumphs, tips (heh) and horror stories.
*Note: I give all "legends" the benefit of the doubt untill proven horribly guilty of anything.
**Note: While Scott Peterson is doing a life sentence for killing his wife, Drew Peterson has not been convicted in the disappearances of his third or fourth wives.