Um...hmmm I'm thinking it might be the stirring up of the mercury during sex. Because of the increased heart rate, and everything else that would be like vigorous exercise and that can really cause a person to crash. Not just the stirring up of mercury, but the adrenals as well can get stressed. Also, if you are female it could be the mercury in your partner's semen.

Sorry to be kind of graphic here, but those would be the ONLY reasons I could possibly imagine would cause this crash after it.

I dont know how you would avoid this crash because whilst you yourself are still mercury toxic, you, like the rest of us will go down hill easily from any exertion or increased mercury exposure.

I'd say to make sure you are giving your body every opportunity to gather as much strength as possible as it's coping with this toxicity. The way to do that for many on here, myself included really is diet, plus supportive supplements and of course amalgam removal and safe chelation. Diet means no sugar whatsoever, no honey, no fruit, no potatoes, no milk, no grains. All those things add to the burden becuase they feed the yeast inside your body which is already (in most poisoned people) out of control becuase your body is poisoned and usually cannot keep yeast at normal levels.

If you eliminate those foods, at least temporarily until the yeast has been lowered, you maybe able to include them again later on. But I'd strongly advise you go on a candida diet, if you're not already and include plenty of healthy foods like eggs, meat, chicken, vegetables (no potatoes though) and possibly some acidophilus yoghurt etc and plenty of healthy fats like butter, olive oil, virgin coconut oil, fish oil (mercury free, and preferably cod liver oil). You'll have to get rid of caffeine, that is yet another stress on the adrenals and apparently can interfere with mercury detox. So you maybe drinking water and herbal tea and hot lemon drinks (you can have lemons).

This is just a suggestion though, something that may help you during this process. But chelation really is the only cure. The diet if you decide to do it can take weeks before you notice an improvement and takes patience and persistance. It's not easy for those of us used to sugars etc, but if you have high yeast levels they too can make you much sicker alongside the mercury and also interfere with detox and overload your gut and liver.