When observing lock-ups, what signals produce confidence in your mind that a successful lock actually occurred? Merely having tails together doesn't mean a home run was hit, right? Here are a couple pics from two occasions. (I'm talking about insemination not conception of course).

Event #1

Lining up the bodies is a good indicator he's doing some romancing. (next pic is close-up)



Close-up reveals his tail-wrap. Seems like he's definitely going for it!



Event #2:

I like the look of that tail curl. (Toes curling? )



I think he needs a cigarette and some time off.

What do you look for?