While it's not really anything new, it does appear to be happening more openly and seems to be more accepted. The article skips a couple ideas that pop into my head as to why "straight" guys are engaging in "gay" sexual activity.
Look at the guesstimates that have been bandied about for decades: Approximately 10% of the male population is gay. If that's true, then it stands to reason, does it not? that 10% of the male population is straight. So, where does that leave the other 80%? As the B's, T's, and Q's of the LGBTQ community find more acceptance, perhaps the stigma is sloughing off.
or even with one another
rather than strictly for purposes of procreation.