Chewing gum

chewing gum burns about 11 calories and hour
you can chew gum for about 16 ish hours a day

if you chew gum daily for 16 hours you will burn 176 a day from just chewing to burn one kilogram of fat you need to burn approximately 7000 calories

which means if you chew gum for roughly 40 days for 16 hours each day you can lose weight very slowly if you watch your calories

meaning

sucking cock is a viable weight loss tactic