LORE DUMP:
In the Singularity universe, aliens think humans are weird. Very weird.
The aliens have no use for perfume, lotions, or body oils. Attraction is usually done with verbal or visual cues. And sometimes, itโs pheromones. (One species in particular has to take drastic measures when their body betrays them.)
They donโt chemically alter their food. While they may turn them into a paste for MREs or a powder, their food is pretty much consumed in its natural state.
Their physiology functions near perfect. There are performance enhancers and medical remedies, of course, but they see no need to fundamentally alter their physical body unless they need to. (E.g, amputation, organ transplant)