Further research involves building a "bat porn box" to catch more mating acts on camera.

Do you suppose bats that arm wrestle keep saying “no homo” to one another?

And here’s a great highlight from the article:

To find out, Fasel et al. perused close to 100 videos depicting serotine bats in flagrante. Four of those videos came from a bat rehab center in Ukraine, but the rest were filmed mating in the attic of a Dutch church by an intrepid citizen scientist.

The bats usually mated for less than 53 minutes on average, although one stud persisted for an impressive 12.7 hours.