Just so you're aware so you don't embarrass yourself in mixed company or your "job", a side of beef is literally a piece of meat. A side of beef is one half of the animal after it has been dressed. A 'side' is then broken down into larger pieces called primals. Those are then broken down into cuts of meat for customers at butcher shops.
A side of beef is literally lots of pieces of meat. So your "argument" in true Houseman the sexist troll form, is essentially "Its not a car, its a Toyota Sienna."
So your argument is that any word or phrase that includes meat or meat accessories automatically filters down to the "piece of meat" phrase, which is derogatory for "woman"?
So to "beat one's meat" means to beat one's wife? Interesting...
"Where's the beef?" means "Where's the woman?"
"dead meat" means "dead woman"
"meathead" means "one who has women on their mind"'
"fresh meat" means "underage women"?
"put meat on one's bones" means "to... eat women?"
"beefcake" means "a good looking woman", as opposed to a "good looking/muscular man" as I've been lead to believe.
Also, nice copy/paste from the first google result.