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1.
When you reach all the different bases with a different partner in one night. ie. you make out with someone, you get fingered or a hand-job from someone else, oral sex with yet another partner and finish the night going all the way!
Hey man, so I went to Bennigan's last night and totally pulled off the "sex cycle"...
Dude...Teach me!
by Overloaded April 27, 2009
 
2.
A bicycle (stationary or normal) with a dildo attachment that thrusts when peddled.
Sexcycles are the newest health fad. Sexcycles come in single or double penetration gear.
by Shemale Cygnet November 23, 2008