The bond has been assumed to be a vow of chastity. The "Purity Bond" may or may not require ceremony candidates to be chaste, but it does require them to be trustworthy.
The subject first came up in the YouTube comments for the LG15 video Boy Problems... when a YouTube user, laura1101, asked Bree the following question:
Bree replied:laura1101 wrote:hey, do you like him?? im not trying to be nosy or anything but why would ur parents not like it that dan likes you? it'll sort itself out in the end anyway! just act normal around him:)
The "Purity Bond" was then assumed to be a vow of chastity. Later, in the video My Difficult Decision, Bree says:lonelygirl15 wrote:It has to do with our beliefs about "purity bonds" I know it's complicated but I don't think I can go into it here. they would never go for me dating.
Sneaking out to meet Daniel, Bree had violated her "Purity Bond." Clearly, the act of sneaking out is not a problem with Bree's chastity; Bree's sneaking out is a violation of her trustworthiness.lonelygirl15 wrote:I was so upset when I got home that my parents knew that I'd snuck out. I told them everything. They said that I had violated my purity bond and that I shouldn't be allowed to do the ceremony.
The "Purity Bond" doesn't only require chastity, although that still may be a part of it; The Hymn of One requires ceremony participants to be trustworthy.