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1.
Any sexual activity other than actual sex. ie: oral sex
Jim- I was giving her other sex and she wanted to send out a text message to her friend.
Bob- You must not be good at it then
by smurffsie December 09, 2011
 
2.
a disparaging term used of woman; the fair sex. used with the definite article.
In patriarchal society, the other sex is considered an inferior lot.
by uttam maharjan March 20, 2010