The predicament you expressed concern about is not unique, no matter your orientation. There are sexual interactions where each partner finds what fulfills one another. In some case it might satisfy one, yet with body language we let one another indulge to gain there maximum level of gratification. It's neither selfish nor self-indulgence if both are in harmony. I'm many ways we tend to stereotype our roles in various sexual positions and activities... Such as "oh he's the top guy". We need to be mindful that it's hardly a visible attribute and we never know until we ask or get down to it!
With climax and release, weather its internal or external may be a simply to figure out by asking your partner what he prefers and then you can come to a mutual understanding of the possibilities. Keep in mind that many men can only release by masterbation!
It can be a basic that having internal release is difficult since there is to much lube, not enough lube, the top guy had the phobia of condom use and feel...(some can be modified and other just don't work for either guy) but condoms offer safe sex.
With the issue of release, it's hardly unique for guys to shoot externally and it's seen in many videos. Of course some are done for the visual impact and many are done since guys are skilled at self gratification by just the correct touch and feel on there penis overall... (aside from those which have compulsive self-gratification issue, which if is a far different matter).
With our ability or desire to achieve climax we tend to find out comfort zone. Yet while being intimate it good to try and worth with body language to find a mutually gratifying outcome. As some prefer oral, other love the feel of the release within there body as well as others like to feel the fluid on the body etc.., There are no fixed rules and pre-defined positions each must follow. Being intimate is sharing, thus what one craves another may find offensive and we each can find our zone and be considerate. If you cannot release internally there are good and usually valid resons. If it's not an issue for the partner that's great. If it's a mutual issue then try small steps one-by-one, i.e. Lube or very little, possibly none, condom or "BBC" (bare back), positions, doggy or on your back... pill or no pill, Prep or not... It's wise to share and stay safe...if both are open and comfortable things tend to meld real well and best thing actually is that none are gender specific nor orientation. If each is open minded and
mature we find what's ideal! Not stereotyped profiles...
The first encounter was traumatic and might have caused this inhibition.Sometime some even may depress suspend some sexual activity. You may contact your family doctor for guidance.If a receiver does a anal peripheral prostate massage, it becomes easier for penitration. It also helps in erectile dysfunction. Google the above phrase. You may also receive some suggestion from other members as well.