Its partly because you are putting an Abrahamic framing on it.
For example, Buddhists do think you advance by giving up all attachments, which includes not only sex, but all forms of love for individuals - the Buddha left his wife, child, and society to seek enlightenment, and that is their ideal. Buddhist monks are celibate. Hinduism can be very austere too.
Christianity is actually a pretty sex positive religion - the Catholic Church requires sex as part of a sacrament (a marriage is only valid if consummate) and there are similar rules in the other big churches.
The anti-sex cults are pretty small. They are not all nutcases either - Shakers seem OK AFAIK, for example.
I think what you are aware of in terms of extreme groups reflects the culture you live in. There are Hindu nationalists, there are violent Buddhist movements, etc.
The biggest and most violent extremist movements of the last 100 years or so have been non-religious ideologies, often anti-religious ones.
For example, Buddhists do think you advance by giving up all attachments, which includes not only sex, but all forms of love for individuals - the Buddha left his wife, child, and society to seek enlightenment, and that is their ideal. Buddhist monks are celibate. Hinduism can be very austere too.
Christianity is actually a pretty sex positive religion - the Catholic Church requires sex as part of a sacrament (a marriage is only valid if consummate) and there are similar rules in the other big churches.
The anti-sex cults are pretty small. They are not all nutcases either - Shakers seem OK AFAIK, for example.
I think what you are aware of in terms of extreme groups reflects the culture you live in. There are Hindu nationalists, there are violent Buddhist movements, etc.
The biggest and most violent extremist movements of the last 100 years or so have been non-religious ideologies, often anti-religious ones.