I have two older males (16 & 12) that, although both fixed, make love to their blankies. I always sing to them that James Brown song "Who's making love to your old lady, while you were out making love", but I reword it to say: "Who's making love to your old blankie, while you were out making love." Anyhoo, I attribute it to them getting neutered too late. We didn't get Edwin until he was a year, and he was feral; my vet said that when you neuter a male that has had testosterone going through them for that long, you'll never fully get it out of them. Related but unrelated to your situation, I know. I will say that we had Ed on a medication (I can no longer remember which one), and he grew mammaries- like a pregnant female- and then they went away. Was so weird.