Semen coming out after urinating and making ghusal

Q: Can you please check if I have understood this properly: A man ejaculated during intercourse, he urinated and then did ghusl then more semen came out without desire, before taking 40 steps, urinating or sleeping will he require new ghusl? I read that he would not need new ghusl but this is what I was taught:

A man ejaculated during intercourse, he urinated and then did ghusl he took 40 steps, urinated or slept then more semen came out without desire. I was taught if it happens like this then no ghusl is required. Are both correct or not?

Semen coming out after ghusal

Q: In heavenly ornaments it says if a woman ejaculates and has ghusl and then more sexual fluid comes out of her she will require ghusl. Is this after 40 steps, urinating or sleeping - or does that just apply to men? Does the book mean if more comes out with desire? How is this understood?

How should one reply to the Azaan if one forgot to reply from the beginning?

Q: If a person did not repeat the words of the Azaan immediately after the muazzin but only remembered at the end of the azaan at the time when the muazzin reached Hayya Alal Falaah, can he repeat the words from the beginning of the azaan or he should only repeat the words of the muazzin from hayya alal falaah?

Exchanging gifts

Q: There is a custom in some communities, that is; when we give some prepared food to our neighbor or somebody they always give back something which they prepared, in the same plate in return. The problem is, when nothing is found in their home they refuse to return our plate empty and say that, "I will give later"because of custom. Is this an act of sunnah to give back something as hadya in the same plate when one receives hadya from a neighbor or someone else?