I feel a common issue with such "dead bedroom" discussions is the seeming lack of capacity of some parties (including some prominent toplevel comments here) to understand how
deep a
need for sex many people have. To think sex can be replaced with "strong friendships" is
laughable to anyone who actually feels a strong desire for sex.
The dead bedroom situations I've seen with my friends (M->F equally as well as F->M) are always the result of one party being incapable of understanding the other's desire for sex. This leads them when pressed to try approaches such as, substituting "being nicer" for sex, trying therapy to reduce their partner's sex drive, or just forgetting about the problem because they are unable to sympathize with it. Ideas such as initiating sex more often or opening up the relationship either don't occur to them, are vehemently opposed, or forgotten about.
No-one is entitled to sex. But individuals in a sexually-exclusive relationship are entitled to sympathy, action, and compromise from their partner to bridge severe differences in sexuality, just the same as any other sticking point in a relationship.