I have one of these. It humps at a vigorous pace- not at the Barry White speed in this gif.

http://www.amazon.com/USB-Humping-Dog-White-Dalmation/dp/B000LA3F7O/ref=sr_1_1?ie=UTF8&qid=1345485761&sr=8-1&keywords=usb+dog

Like the "USB Humping Dog"

http://www.amazon.com/Dalmation-USB-Humping-Dog/dp/B000LA3F7O/ref=pd_sim_dbs_misc_title_9