Even if an SP totally complied with your orders, a condom cannot protect you from gential herpes, if she is infected, unless you wrap yourself in saran wrap to avoid any contact with her skin whatsoever. At that point, she will probably become paranoid about you and end it. Stay faithful to your vows and your wife. The 15 minute high is not worth the days after when you wonder if she suspects you cheated, or you worry about catching something and transmitting it. If you've got a good marriage, you are risking too much. I see carefully selected SP's between gf's, and I enjoy it like everyone else, but a relationship and commitment is a whole other thing -- you have to decide if the vows you took still matter or not.