With bipolar there is a tendency toward heightened sex drive in the manic/hypomanic phase and a decreased/non-existent sex drive in the depressive phase. Of course these are tendencies and I would think they may even reverse in some people. If you are having a problem with maintaining an erection it may be a function of a medication-- many antide... more
If his penis is coming too far in the mouth, it could initiate the gag reflex. In general, I would think that if after doing this, it is making you sick, it would be best to not do it. Your loving partner would most surely understand.
There are a variety of causes of difficulty swallowing.. Many of them are not serious... Some are acute such as throat infections, etc. It does seem as though a social anxiety could be causing this with you BUT one of the warning signs of Cancer is difficulty swallowing so I would definitely have it checked out by an MD. Better safe than sorry.
Due to a variety of factors, a hard and fast "8-10" glasses, etc cannot be substantiated. If you are walking in 110 degree heat or are in an endurance race, you will need A LOT of water. Sitting in the cool, not so much. Also certain problems enhance your need for water intake such as Diabetes.