Testosterone CAN be released before sex with a 'novel mate' and is referred to as an "Anticipatory Release" and testosterone CAN also be released after ejaculation and is referred to as "Ejaculatory Release".
Now, the studies behind it show that there is variability to whether or not there is release. More studies show that it is released than not released. The variability occurs because of difference in testing testosterone levels, the frequency they are tested, and over what period they are tested. The intensity of the arousal also plays a role in the release of testosterone. Lastly, stress and genetics also play a role. Sometimes, you are genetically not able to do so.
I did not read through these all very thoroughly. I don't remember any numbers given either. One article gave a percentage of an increase in 35% after viewing sexually explicit material, however the resource was not available through my school.
I would say that it is variable and it may or may not be released. Either way though, with the amount of androgen blockers you are taking it wont matter. With higher levels of estrogen, your body produces less testosterone naturally so your androgen blockers don't have as much to combat anyway.
I mean, lets say that I have a 35% increase in my testosterone levels. My levels are right around 10 ng/dl. A 35% increase would be around 3.5 ng/dl, bringing my total levels to around 13.5 ng/dl. A woman's normal level (average) is between around 10 and 80 ng/dl (I have also heard 20 and 80). Granted, the study that gave out that percentage of 35% I was not able to read, so I am making assumptions that it is talking about total testosterone levels, and not a 35% increase in testosterone released. Feel free to bash my math if it's not right!
Lastly, these studies were conducted on genetic men, and therefore I cannot make any conclusion for our FtM friends. Sorry.
All in all, it will not make a difference, and I wouldn't worry about it.
Data found
here,
here,
here,
here,
here,
here,
here, and
here.