Prohibitions - need to desire & yet avoid them

Shaloh (Asarah Mamaros 3-4:28): ... Chullin (109b): Yalsa said to her husband R’ Nachman: “We have a rule that whatever the Torah prohibits there is something similar to it which is permitted. Blood is prohibited while liver is permitted. A woman is prohibited as a nidah but is permitted when she is pure, of a domesticated animal is prohibited but is permitted from non‑domesticated beasts, pig is prohibited by the similar tasting shebuta is permitted, the girutha bird is prohibited but the similar tasting tongue of fish is permitted, a married woman is prohibited but a divorce is permitted even though her former husband is alive, one’s sister in law is prohibited but she is permitted when the brother dies, a non‑Jewish woman is prohibited but a yofas to’ar is permitted. I want to know what it is like to eat meat cooked in milk?” R’ Nachman told the cook to prepare fried udder for her. This seems problematic. Why was such a distinguished woman such as Yalsa discussing such an apparently trivial topic with her husband? It is doubly puzzling why our Sages saw fit to record this in the Talmud? My father explained that this is based on the principle that all that is prohibited is because G‑d wants it prohibited – not because it isn't pleasurable. Therefore the sole reason for not enjoying these pleasures is because G‑d prohibited them. This is similar to Toras Cohanim(Kedoshim): A person should not say that it is impossible to eat pig but he should say that it is possible but what can he do since G‑d has prohibited him from eating it. Yalsa wanted to know what she was missing by observing the prohibition of meat and milk. By knowing what pleasure she was prohibited she could have a genuine desire for the prohibited pleasure that she would refrain from solely because of G‑d's command. That is why the taste of the shebuta fish is like that of pork so that a person can no what pork tastes like and know that it is good and desire it but at the same time refrain from eating it solely because G‑d told him not to eat it. The Torah has forbidden us to eat meat and milk. She wanted to know what meat and milk tasted like so she could desire and then not eat it because G‑d said not to. Therefore her husband told her to eat fried udder which has the taste of meat and milk.

Rambam(Shemona Perakim 6): We find that to have a strong desire to sin is much better and perfect than not having any desire and not suffering from avoiding the sin. … In fact our Sages say that,“the greater the person is the greater is his yetzer harah.” Not only that but they say that the reward for self‑control is proportional to effort required for that self‑control, “According to the suffering is the reward.” Furthermore they caution a person from saying, “I naturally don’t have a desire for this sin even if the Torah hadn’t prohibited this.” That is expressed by R’ Shimon ben Gamliel:” A person should not say that it is impossible for me to eat meat and milk together or that it is impossible for me to wear shatnez or that it is impossible for me to have sexual relations with this woman who is prohibited by the Torah. But in fact it is possible but G‑d has decreed that it is prohibited.”… However those things that the philosophers say are bad and that it is much better that a person not have desire for them – that refers to things which are widely perceived by people to be bad - such as murder, robbery, stealing, fraud, harming an innocent person, harming someone who has helped you, ridiculing parents and other similar matters. These well known things are what our Sages said: “That even if they had not been prohibited by the Torah it would have been assumed that they were prohibited.”… These well known wrongs are called by some scholars as “rational mitzvos”. One who desires to violate a “rational mitzva” is obviously an imperfect being. That is because a perfected person has absolutely no desire to do this type of evil and is not upset by avoiding them. However those things which our Sages were saying that it is best to overcome a desire for them - are the religious mitzvos. Because if the Torah had not been given they would not be viewed as bad at all. For this type our Sage say that it is it is only the Torah which prevents a person from doing them.