I had anal sex once ,on dat day I felt little pain in my stomach .after that I didn't felt any pain .bt after some day I read about rectal discharge that can be caused by anal sex .i don't have any symptom of rectal discharge .bt sometimes I observe a wet dot on my undergarment after coming from washroom .bt after some time it disappeared and I don't found anything on my undergarment ,not any coloured stain ,no patch .can it be a rectal discharge? Can it be also be in simple transparent liquid form.