There is phone-sex, sms-sex, letter-sex, oral sex, genital sex,

thoughtie sex and tantric sex.

If you are having sex with someone and it is keeping both of you

happy, then the desire to stray is minimal.

Oral sex is so desired by men because you get your jollies without

the effort, able to concentrate on the pleasure without distraction.

Women may also have the desire, lol.