Cleanshaven's "The Evolution of Man" is a raw, explicit exploration of gay desire. Two uninitiated men, their eyes filled with lust and curiosity, begin their journey of sexual awakening. They tentatively touch each other, their hands exploring every inch of skin, their breath coming in short, sharp gasps. They kiss, their tongues dueling, their bodies pressing together. Their hands move to each other's cocks, stroking, feeling the hard, throbbing lengths. They moan, their bodies grinding together, their lust building. They fall to their knees, their mouths replacing their hands, taking each other's cocks deep into their throats. They fuck each other's mouths, their bodies moving in a primal rhythm, their lust consuming them. They come, their bodies shaking, their cum filling each other's mouths, their transformation from innocent to carnal complete.