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Any large rock. A sex rock is often found around a house in the landscaping. A sex rock can be any shape but must be large enough to have intercourse on.
"Look at that new boulder in Anderson's yard"
"Looks like a great sex rock!"
by patsy ulso December 24, 2011
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Elusive rocks found on the shores of lake Huron. Legend has it if you find a rock with the word sex etched into you can exchange the rock to anyone you wish for sexual favors.
I found a sex rock on the beach. I am going to trade it to you for a old fashioned.
by Crispy boy June 28, 2018
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