From the "Consistency" section of our Dictionary of Semenyms:

gel - this will stiffen your hair; used to describe the sticky quality of semen. “She let go and reached her finger up to her mouth to lick off a drop of semen, then sat back on her haunches and reached behind her and pulled from somewhere a white terry-cloth towel that she used to wipe the cooling gel off of my stomach.” —TonTon, The Bridge that Brought You Here