Another origin theory is that in the 1930s, a sailor taking shore leave in London would have to pay a prostitute dearly for the (then) exotic service, usually all of a sailor's leave allotment (which the prostitutes somehow knew to a precise ammount), an act commonly referred to as "blowing all one's cash," making the service a "blow it all job," or "blow job." Another story says that it comes from a perception that fellatio less often causes orgasm than traditional intercourse, causing many cases of blue balls - a blue job - and the word blue mutated into blow.
This is what I found, not sure if any of them are accurate.
Slightly off topic, when I was in school, a lot of kids thought a screw or screwing was because the man got on top the woman, put his penis in her vagina, and then the both moved round in opposite, circular directions, hence the term 'screw'...
Another origin theory is that in the 1930s, a sailor taking shore leave in London would have to pay a prostitute dearly for the (then) exotic service, usually all of a sailor's leave allotment (which the prostitutes somehow knew to a precise ammount), an act commonly referred to as "blowing all one's cash," making the service a "blow it all job," or "blow job." Another story says that it comes from a perception that fellatio less often causes orgasm than traditional intercourse, causing many cases of blue balls - a blue job - and the word blue mutated into blow.
This is what I found, not sure if any of them are accurate.
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