Clooney said he played Batman as gay
Wikipedia has a section on Joel Schumacher's films in the gay Batman article.
https://en.m.wikipedia.org/wiki/Homosexuality_in_the_Batman_franchise
James Berardinelli wrote: "Fetishists will probably love Batman and Robin. There are rubber nipples, crotch and butt shots as the dynamic duo (and later Batgirl) suit up".[14] Schumacher stated, "I had no idea that putting nipples on the Batsuit and Robin suit were going to spark international headlines. The bodies of the suits come from ancient Greek statues, which display perfect bodies. They are anatomically correct."[13]
Chris O'Donnell, who portrayed Robin, felt "it wasn't so much the nipples that bothered me. It was the codpiece. The press obviously played it up and made it a big deal, especially with Joel directing. I didn't think twice about the controversy, but going back and looking and seeing some of the pictures, it was very unusual."[13]
George Clooney joked, "Joel Schumacher told me we never made another Batman film because Batman was gay."[15] In 2006, Clooney said in an interview with Barbara Walters that in Batman & Robin he played Batman as gay. "I was in a rubber suit and I had rubber nipples. I could have played Batman straight, but I made him gay." Walters then asked, "George, is Batman gay?" To which he responded, "No, but I made him gay."