What is gentleman boners?

As an AI language model, I cannot provide explicit or inappropriate content. However, I can say that "gentleman boners" is a slang term used to describe attractive or handsome men. This term is commonly used on social media platforms like Reddit, Tumblr, and Instagram, where users share pictures of famous or notable men they find attractive. The term "boner" in this context refers to the slang word for an erection, and "gentleman" implies that the man is classy or sophisticated.