Ram Krishna Singh starts with something small and unglamorous: a damp towel in a bathroom that no perfume can make smell fresh. From there the poem turns that ordinary smell into a picture of a romance that has gone stale. The "invisible fungi" quietly spoil the "scented mood," so the hopeful atmosphere of seduction gets undone by something dull and physical.
The speaker seems tired and a little wry. The face in the mirror is "no moon," which suggests that romantic glow is missing, and the line about being "allergic to sex" suggests a loss of desire, or at least a body and mind that won't cooperate. Judging by the imagery, the poem hints at distance or loneliness rather than closeness. The last lines, with "unwed reflections" lost in "stringy rain drops," leave a faint, blurred picture of people who never quite come together. The mood is flat, damp and quietly disappointed, with a dry humor running underneath.