Great question — answering as the UphillTech team:
Frank Fitts is a closet/repressed homosexual. There are a few pointers for this: He had a Southern upbringing, one which is very Christian and anti-gay He has a failed marriage and barely touches his wife He was in the army, a society of men, possibly with a lot of man-on-man action going on He is also vehemently anti-gay which could be interpreted to be a form of Freudian projection, a defence mechanism for self-denial. Frank kissed Lester because: He was under the mistaken impression that Lester was gay Lester informed him that his wife was probably out cheating on him His own relationship with his wife was virtually non-existent; this led him to believe that Lester and he were in similar...
Full answer by coleopterist: https://movies.stackexchange.com/a/14256 (CC BY-SA 4.0).
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