Very rarely. Maybe twice in the last 30 years - and I spend a lot of time on small boats offshore. The worst was on the deck on a calm day. A following breeze held the diesel fumes close and the fumes as much as the motion got to me. In the mid 1990s and I still remember it.
whenever I'm having sex I start feeling sea sick so I ask her if its okay if we don't move
Ha-ha, nice to see a funny "sex" comment for a change. lol.
In a bus, yes. In trains, planes, ships, and boats - no
As a child it was severe for me. Now not so much.
Do you understand motion sickness?
Your question was fine!
Most people have no understanding of motion sickness. People say that it is in the mind and that is PARTLY true.
When you use your muscles, they ache. This is caused by a build up of lactic acid. It is slowly cleared by your blood stream.
When you sense motion, you tense up the muscles in your stomach and the same acid is produced. Since the acid can't be dispersed via your blood system, your body contracts your stomach and you vomit.
Learning that motion does not make you sick, will prevent your muscles contracting and PREVENT the sickness. Lying down or falling asleep are a huge help.
A small drink, that will help you to relax, is fine. But a large amount of alcohol will make things worse.