Which situation is NOT a possible transmission route for fungi?

The situation involving consuming heated food is not a transmission route for fungi because fungi typically require specific conditions to thrive, which include moisture and an organic substrate, rather than surviving the heating process associated with cooking food. When food is heated adequately, it usually reaches temperatures that kill most fungi and their spores, making it safe for consumption.

In contrast, swimming in a public pool can expose individuals to fungi if the water is contaminated. Inhaling dust from the environment can introduce fungal spores into the respiratory system, leading to potential infections. Unprotected sex can transmit certain fungal infections, particularly those related to sexually transmitted infections. Thus, while all the other options entail pathways through which fungal transmission can occur, consuming heated food does not serve as an effective transmission route.