This deer shows that love doesn't have to be just between two people - it can be between species as well. The man was trying to enter his vehicle, when the deer jumped on his back, trying to mate with what he perceived was a female. The photo was uploaded online by the man's grandson - what a lovely thing to do, right? The grandson succeeds in "immortalizing" this epic moment his grandad had.
Luckily, it's a good thing that the grandfather has a sense of humor and didn't get offended by what his grandson did. Some older folk could easily get offended by things like this, as they lived in a different time, a period when self-deprecating humor wasn't a thing, and people tried very hard not to embarrass themselves in public. It's a good thing those times have passed!