Exodus chapter 19 part 1

After reading chapter 19:

*Now, in the third month after the Israelites left Egypt, they enter the desert of Sinai and camp there in front of the mountain. Yahweh spoke to Moses from the mountain. God told Moses to remind the Israelites that he was responsible for bringing them out of Egypt and bringing them there to himself. They are to obey him fully and they will be his treasured possession. Although the whole world belongs to him, they will be special snowflakes, a holy nation. Apparently this mountain was Yahweh's home. The Wikipedia article shows us that no one really knows for sure where this was supposed to be. There is more than one mountain in the desert of Sinai.

*Moses told the people what Yahweh had said. The people replied that they would obey the lord. Moses took that message back to God, like he didn't already know the answer. Yahweh told Moses that he would speak to Moses from a dense cloud so the Israelites would hear and trust Moses as his messenger.

*The people were to spend two days getting ready for Yahweh to come down on  the mountain and address them. They were to wash their clothes. (God doesn't like dirty clothes?) I wonder where over a million people got enough water to wash their clothes in the desert.  They were to stay away from the base of the mountain and not touch it. If someone touched it, that person would be stoned to death or shot with arrows. I wonder who was responsible for carrying out the executions? Even animals that touched the mountain were to be killed. Had God cared if animals touched the mountain in all the millenia that came before?  The  mountain could only be touched after a long blast from the ram's horn. Moses told the Israelites all this and included a command to abstain from sex. Was this command from God or Moses? How did not having sex matter? I wonder what the consequences for having sex were, and how would anyone except the people involved know?  My study bible assures us that it was not because sex is sinful, but because it may leave people " ceremoniously unclean." The text does not say this. How in the world do you measure ceremonial dirtiness, exactly what is it, and why does God care about it?

Edited.