Question

which of these is unhealthy behavior?
sleeping late
unprotected sex
lake swimming

Explanation:

Sleeping late can disrupt the body's internal clock and cause various health - related issues like fatigue and decreased cognitive function. Unprotected sex can lead to sexually transmitted infections and unplanned pregnancies. Lake swimming may carry risks such as water - borne diseases, but unprotected sex has more immediate and serious health consequences in terms of both physical and reproductive health.

Answer:

Unprotected sex