Answer:
Yes
Explanation:
A sexually transmitted infection (STI) can still be transmitted even if the two individuals are abstaining from sexual intercourse. The pathogens responsible for causing STIs may be present on the skin of their genitalia or in their bodily fluids (e.g. pre-ejaculate, semen, vaginal secretions). Oral contact with the infected person's genitalia (oral sex) can result in them contracting the same infection.
A few STIs in which this can occur are:
If Vernon and Isaac want to decrease the likelihood of transmitting or outright prevent the transmission of STIs yet still participate in other sexual activities that are not sexual intercourse, they should use barrier contraceptive devices like dental dams and condoms, maintain a monotonous relationship and participate with only a single partner, and receiving comprehensive STI testing.