The first male nude photos I have tried to shoot was with my brother as model and I found it difficult to photograph male nude. With women it is easier find a good body composition which match the women body language and personality. While with man I found all my shots weird, because it was a male nude with female body language, and it wasn't intentionally but I just was trying to find a good body composition and probably my experience with female models influenced on it.
My brother when looked at it he said "you made me look/pose like gay".
Nothing against homosexuality but it is clear to me that photograph male and female are two completely different things with different body composition and visual language.
Out of curiosity, how do my male nudes strike you, given your comments regarding your experience photographing your brother? Are they, in your perception, masculine or feminine, or somewhere in between?