As far as a handjob goes. Basically, it's manual stimulation of the genitalia, and when the term "handjob" is used, it usually means that it's performed on male genitalia. Usually, the partner performing the handjob will lubricate either their hands or the penis, and will stroke up and down the shaft until ejaculation.
I hope that helps, let me know if I can clarify anything else for you.
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