I agree that stretching can have an effect on EQ. I try to anticipate when my girlfriend and I will be having sex and avoid stretching that day. We almost always have sex on the weekend and maybe once during the week. I do my PE Monday through Friday and rest on the weekends which usually works out pretty good.
And yes after stretching I always do dry jelqs at a low erection level, with some squeezes and lately occasional edging. These exercises help in getting blood flowing back into my unit after the stretches and really help with my EQ.
Overall my EQ is excellent but if we happen to have sex on a day when I did some heavy stretching, EQ can suffer some.