Some of the most common STDs include HPV, chlamydia, herpes, gonorrhea, and trichomoniasis. The four STDs that are incurable are HPV, HIV, herpes, and hepatitis. All of the others can be cured.
I disagree with the person suggesting that an average person can go 4 mph for 24 hours straight. I think average distance for an average person walking about 3.5 mph would be about 20-25 miles in a day. Then they are going to want to eat and rest.
Given that the world is about 25,000 miles in circumference and that the average walking rate is 3 miles per hour, it would take a person walking nonstop approximately 347 days to walk around the world.[8]