Interesting question and thread.

Tojo, your comment reminds me of the 1976 Playboy interview of then-Governor Carter:

"I've looked on a lot of women with lust. I've committed adultery in my heart many times..."

It's very had to be on this site and not be an adulterer if we use his line. Though I might change it to "in my imagination".

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What is adultery?

Here are some web definitions of the word adultery:

extramarital sex that willfully and maliciously interferes with marriage relations; "adultery is often cited as grounds for divorce"
wordnet.princeton.edu/perl/webwn

Adultery is generally defined as consensual sexual intercourse by a married person with someone other than their lawful spouse. As there is usually an implicit or explicit agreement between spouses to not have sex outside the marriage, the common synonym for adultery is infidelity as well as unfaithfulness or in colloquial speech, cheating. By extension, adultery may also apply to any other sexual activities committed outside the marriage.
en.wikipedia.org/wiki/Adultery

When one spouse has sexual intercourse with a third party. Grounds for divorce in some states and provinces.
singleparents.
about.com/cs/glossary/a/glossaryA.htm

conjugal infidelity. An adulterer was a man who had illicit intercourse with a married or a betrothed woman, and such a woman was an adulteress. Intercourse between a married man and an unmarried woman was fornication. Adultery was regarded as a great social wrong, as well as a great sin.
www.godweb.org/blT0000100.htm

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In most of these definitions the words "sex" and "intercourse" come into play.

So, what if we (the collective we on the forums) are practicing "outercourse"?

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Outercourse:

Any form of sexual pleasure or stimulation between partners that does not include insertion of the penis into the vagina, anus, or mouth. Activities may include masturbation, erotic massage, rubbing together of body parts, and erotic fantasy.
http://www.thehardnessfactor.com/exc.../glossary.html

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Hmmmmm.... there's that word "sex" again, but this time, there's no "intercourse" happening.

So...no. No adultery in that definition.