If you helped Ringo back in Goodsprings you need to pay 100 caps to get though, but this little “secret” tells you how you can do it for FREE!
Easy and simple
You just gonna look for the outhouse, just walk on the by the fence side and you should find it very quick, then you will get the option to “sit” then do it and volare! you´re inside!
By the way, sorry for the video quality, but it should be possible to see what you should do.