Bromance (non-gay brotherly affection) is totally acceptable in Dubai. And to some extent, male/female displays of affections i.e., hugging and holding hands (provided that both parties are related) is also tolerated.
However, overt displays like kissing and or fondling in public is strictly forbidden. Many unmarried couples have been jailed for doing just that.
Gay relationship is still a taboo subject here, and anyone caught in the act will face stiff punishment.