It is a known fact that underwear pants are private stuffs that should be kept and treated as such. In as much as it is meant not to be seen outside, health reasons outweigh such beliefs. Spreading your panties out in the sun allows the sun rays sterilise the pants and remove all the moisture that would have been there if dried indoors. If panties are left indoors, the moist atmosphere in the bedroom and bathroom allow for microorganisms such as fungi to breed on them which may in turn affect the person wearing them. Read more
Avoid fungal and bacterial growth (Vanguard)
