Once I learned three chords I could play every song written by Poison.
But in all seriousness every love song by Poison is easy to learn. Brown eyed girl is another easy to learn song. If you are into playing by tabs then just pick up a few books and go from there. They are usually around $15 each.
I always prefered the classics by Whitesnake though like "slide it in" or "Spit it out", or if you are looking for a little more romance how about "smooth up in ya" by bullet boys.