My apologies if this is filp​. this is not health question. I clicked it by mistake. this is a biology or chemistry question

Because the substance separated into 2

Air goes past the epiglottis and into the trachea when you breathe in. from there, it goes to your vocal cords in the larynx until it reaches the bronchi. from the bronchi, air passes into each lung.

You can always get a sexually transmitted disease. always ask for consent before doing anything..because you never know if your bf or gf has an std!