It's funny but I tried them now and they worked for me too. But in the past I have been told I need a specific codec in order to play .avi files.

Kicked from behind is a single kick by a woman in nice black suede boots. You get a good view of the woman.

First one features a vibe and a mallet as the title suggests. You get to see the tools and the hit to the balls, but no view of the participants faces.

I assume these are free trailer clips for longer pay-for videos? If so, they are good - you get a good indication as to what you are going to see, and if it's what you like, you may well pay to see more.