Don't: sit on a bus on the lower tier and look at porn on your phone.
especially if there's someone sitting in the seat behind you. Higher up.
Or fidget almost constantly whilst viewing porn onna bus, and occasionally look at female bus goers, covertly.

Was soooo close to telling the bus driver/tapping the oaf on the shoulder and suggesting he sit at the back of the bus... He did have quite a few army tats tho which put me off slightly.

Yuckity.
Though the picture of, I can only assume, his genitals was amusing: either very large erection or teeny tiny testicles!
:))