[Adder]

It is immoral, but not terribly. And again, not worshiping God does not mean you're a satanist or even Evil.

The old testament says:

When a man ejaculates semen he must wash his whole body with water, and will be unclean until evening. Any clothing of leather touched by the ejaculated semen must be washed and will be unclean until evening. Whenever a woman has intercourse with a man both of them must wash, and will be unclean until evening. Whenever a woman has her menstrual period, she will remain in a state of menstrual pollution for seven days. Anyone who touches her will be unclean until evening. Anyone who touches anything she sat on must wash clothing and body, and will be unclean until evening. If a man goes so far as to have intercourse with her he will contract her menstrual pollution, and will be unclean for seven days. Any bed he lies on will be unclean. When she becomes clean of her discharge, she shall count off seven days. After that, she will be clean. On the eighth day, she will take two doves or two young pigeons to the priest. The priest will offer one of them as a sacrifice for sin and the other as a burnt sacrifice. In this way he makes atonement for her before Yahweh for her unclean discharge. Such is the law for a man who ejaculates semen, a woman who menstruates, and a man who has intercourse with a woman when she is unclean.
Leviticus 15:16-19, 22, 24, 28-30, 32-33