How can someone know if a man is sexually attracted to other men?

Homosexual men show their attraction to men in the same way that heterosexual women show their attraction to women. If they are young and/or inexperienced, they may become flustered and uncomfortable when talking to a male they find attractive. The more obvious signs are if they flirt with other men, spend time staring at other men's erogenous zones, or are caught masturbating to male pornography.