The clever cheaters will often do the following

• Never meet in a place where they cannot park and walk to someplace legitimate as a cover story. (Example: meet at a hotel with a busy lounge. Go to the bar, have a drink and watch to see if anyone is watching you. If the coast is clear, slip out and into the hotel. Another example: park at an office building next door to the hotel and cut through the building.)
• They usually don't get involved with someone you (the spouse) know.
• They are always watching for a tail to see if someone is following them.  They make frequent stops and sudden turns and drive extremely slow, just watch traffic.
• Never use a credit card.
• Cancel the *69 option on the land line telephone.
• Never store phone numbers in their phone or write them down. If they do write them down, they will do it in a "code" to hide the real number.
• They usually don't have caller I.D., or if they do, they will cancel it and switch the cellular telephones to blocked number.
• They will clear the phone call history regularly.
• They usually meet at different locations, where the possibility of seeing a co-worker or friends is none.
• They usually take a shower immediately when returning home or they will cover it up with cologne or exhaust fumes.
• They tend to change the passwords of the cellular phone more often and also using a pre-paid calling card, so the numbers doesn't get registered.
• They might get their friends involved to cover their story.
• The more smart ones will have the lover page them with a wrong or disconnected number, so a suspicious spouse cannot determine who had called.