Which of these sexual behaviors is the safest? a) having sex with a condom and while taking a contraceptive pill b) having sex while relying on tubal sterilization or a vasectomy c) abstaining from sexual intercourse and from oral sexual contact

C) Abstaining from sexual intercourse and from oral sexual contact

This is most definitely the safest, as you do not have contact with any bodily fluids.

which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.