Intercourse during the day in Ramadan is haram for men and women while intercourse during the night in Ramadan is allowed. For more, please see the detailed answer.

Local anaesthetic does not break the fast, because it is not food or drink, and is not equivalent to them. If it is a general anaesthetic that leads to unconsciousness that lasts all day, then the fast must be made up.

If a man shakes hands with a (non-mahram) woman during the day in Ramadan, and he ejaculates, his fast is invalidated. He has to repent to Allah from this sin, refrain from eating and drinking for the rest of the day, and make up for that day’s fast later on.

Matters that break the fast only break it when three conditions are met: 1. Knowing the ruling 2. Not forgetting that one is fasting 3. Doing it with free will.

Being given medicine via injection does not break the fast, whether it is intramuscular or intravenous, so long as the injected substance does not provide nutrition.