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This is what Lostpedia had to say about it:

Shannon complains about Boone "flirting with random guys." During a podcast and an interview, the producers hinted that a character might be revealed as gay this episode. This matches the concept of the word "exposé" as well, as Boone was outed, exposed in the episode.

However, the comment could have simply been written as a fleeting insult from Shannon with no actual serious relevance. Furthermore, it should be noted that Boone once had sex with Shannon, as well as possibly dated a girl named Nicole. Thus, if Boone is attracted to men, he would be a bisexual character as opposed to gay character.

Ian Somerhalder also played Paul Denton, a bi-sexual character, in the movie version of Bret Easton Ellis' 'The Rules of Attraction'.