If I was a beetle and was looking for a romantic spot to procreate, I would be totally easily woo'd nestled in a bouquet of goldenrod. The top pic was their courtship I believe, a sort of chilling on top each other before actually doing what they came together for. It would seem the smaller insect is the male, who is on top and the female on the bottom - since you can see in the pic below, that the one on top does the inserting of buggie magic - if fact I could see when they pulled apart again there was a little bit of clear goo. Neato!
Can anyone name these lovers and share what their ecological purpose might be?