DARE:
Measure your penis and post the length as a spoiler along with a dare. If yours is smaller than the one above you, you do that dare. If it is bigger, they do your dare.
Extra:
If you don't believe that the person who beat you really has a dick that size you can message them "PROVE IT!" meaning they have to send a picture of it through PM, if their dick isn't as big as they say, they have to do your dare, if it is the correct size then they can decide any picture for you to do and you HAVE to send it to them through PM as a punishment for making them prove themselves
Loser has to check the mailbox naked
