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1.
Making slow and luxurious love to a soft pillow, rubbing the pillow against one's genitals or thrusting into the pillow, a.k.a. pillow humping. Pillows are actually very humpable and can be used for masturbation by both males and females. Pillow sex is also very safe, because the risk of getting a STD from your pillow is zero unless you share the pillow with someone.
Last night I had very sweet pillow sex thinking about my hot cousin.
by Pulvillus November 11, 2006
 
2.
thrusting you dick inbetween two pillows, as another masturbating method.
Brian stop having pillow sex!!!
by Hulio Mendez February 07, 2005