Recently I discovered that after my first ejaculation I go completely flat and this may linger for hours, what could be the likely cause, please?
Whatever you are experiencing is absolutely normal process. This process is called refractory period. It is the process where the penis cannot get hard after ejaculation. Honestly, your body is just telling you that it needs some time. There is no real way to change it or make it happen less, so just try to work with your body. If you are really hoping to have more sex, then take the time to recharge and focus on your partner. This is a good time to focus on them and give them pleasure. You will become hard again in no time and continue.
Hope this address your concerns.
Love Matters Team.