... it would probably be hilariously disturbing to any alien species we encountered just how fast we'd find out whether or not we could interbreed with them. Or their livestock. Or their ships. Or basically anything else they brought with them. Or, for that matter, whether or not we could eat any or all of the above.

Because I honestly believe that there is almost literally nothing on Earth that some human, somewhere, has not tried to eat and/or have sex with (with obvious exceptions like lava and other things we can't actually touch), and I don't really anticipate that particular habit changing just because we start finding stuff that's not on Earth.