Final answer:
Sexually transmitted infections are mainly spread through sexual contact and exchange of bodily fluids and not typically through sharing food or drinks.
Step-by-step explanation:
Sexually transmitted infections (STIs) are primarily spread through sexual contact, which includes vaginal, an-al, and oral sexual behaviors. STIs are caused by pathogens, such as bacteria and viruses, that enter the body through mucous membranes found in the reproductive organs and can also spread through body fluids like blood, semen, and breast milk. It's important to note that while many STIs are transmitted through blood or shared needles, they are not typically spread by sharing food or drinks since this does not involve exchange of body fluids that carry these pathogens.