You say that for the people who wrote 'Kama Sutra' and who consider 'Kama' (which includes sex) as one of the four necessary things to be done by people (the Four 'Purusharthas' -
Puruṣārtha - Wikipedia) and essential part of duties (dharma)? I need not say that I am hugely surprised. Yes, there are monks in Buddhism (in Hinduism too) but not all Buddhists or Hindus are monks.
Whether it is Hinduism or Buddhism, it tells us what to do now that we are here - that is 'Dharma' (our duties). Both religions consider our existence as illusionary (maya) or non-substantial (anatta). You say that they are narcissistic!
There are hundreds/thousands of views in Hinduism. Doctrines of reincarnation and karma are social constructs to keep people away from evil deeds by frightening them of hell or lowly births. One can have alternate views. I am an atheist Hindu and I do not believe in these things - except in scientific ways. What happens to the material that our body is made of after our death. Is it not recycled, will it not go into other living and non-living things in course of time. That is the actual reincarnation. Karma is a simple scheme - 'You reap what you sow'. Yes, I should keep away from evil deeds because I will suffer if I do not, physically or psychologically. Do you see anything wrong with that?
Detachment is a different thing altogether, a difficult achievement. It does not mean severing of ties but cushioning ourselves from sorrows and disappointments which are galore in life. Equanimity/Samata/Anasakti (not being dependent on) are the other equivalents of detachment. Detachment does not mean leaving everything and going to the forests. In the end, I would say you hardly have any understanding of Hinduism and Buddhism and your post clearly reflects that.