Certainly one needs to be respectful of one's wife's need for rest and comfort, and not be gozel sheina when she is sleeping.
At the same time, we know that Chazal employ the phrase "pas b'salo" in referring to the reciprocal conjugal relationship. Elsewhere does the pasuk say [Parshas Vayeishiv 39:6], regarding Yosef, Potifar, and Eishis Potifar: "V'lo ito m'uma ki im halechem asher hu ochel." Namely that Potifar gave Yosef free reign over his entire household, except for his (Potifar's) own bread, which he himself alone enjoyed. Rashi says "V'hee ishto, b'lashon nakiah" -- i.e. Potifar's wife. She was his, and his alone, to enjoy. That is Mr. and Mrs. Potifar, to the exclusion of anyone outside the marital bond. Not that she held by that restriction obviously, but that's beside the point.
Then, vayter in Chumash it says in Parshas Eikev (8:3): "Ki lo al halechem l'vado y'chiyeh ha'adam, ki al kol motza pi HaShem." Not by bread alone does man live but by that which emanates from the Mouth of HaShem.
So l'ma'aseh we see that there is both a symbiotic relationship between devar HaShem and pas b'salo. You are absolutely not wrong in desiring a conjugal union with your wife. Yaakov Avinu even tells his meshugineh shveir, Lavan harasha [Parshas Vayeitzei 29:21]: "Hava es ishti ... v'avo eileiha" -- "Give me my wife (your daughter) so I can have bi'ah with her." And lest we think that the Torah was being ambiguous on the subject, the pasuk tells us two verses later (29:23): " vayaveh otah eilav, vayavo eileiha."
The Torah does not use a mystical lashon of, say, "Give me my bershert so that I can achieve ruchniustic shleimus with her; so that I can become a neshama shleimah, instead of a palga neshama; so that I can achieve oneness; or become a true eved HaShem by being m'shamesh her.
The Torah tells us exactly what it going on here, albeit it relatively clean language. It is we, in our generation, who try to obfuscate the metzius of what is taking place. It is we who think there is something unseemly by what Yaakov is doing. But the Torah is conveying to us that there was nothing filthy, degrading or trashy about spousal intimacy.
Obviously our wives are not our fantasy objects. And like I counsel all my young men who come to me for marriage and relationship counseling, foreplay does not begin when you close the door. It begins the morning of, or the day before, when you plant the emotional seed, or spark the erotic flame. And the flirtation/seduction continues throughout the day with phone calls, text messaging, surprise notes or cards, flowers delivered, etc.
L'ma'aseh that dish is metzamek v'yafeh lo. You need to bake it slowly, adding just the right amount of seasoning, at just the right time, and let it simmer. You can heat up the flame from time to time with a phone call, or stopping by her place of work and taking her aside, and telling her something sweet, loving and intimate. You leave, and the heat dies down a bit. But it still simmers. Then you text her a few hours later something really loving and sweet.
I understand the frustration of having a wife who always seems to be tired, or just wants to be intimate on her schedule, like you're booking an appointment. It definitely aggravates shalom bayis, and then that maybe serves as an excuse for acting out inappropriately on a website. Sometimes shalom bayis necessitates her being available to her husband, even when she is doing it more as a chesed than as an act of passion. In those instances, though, that is her saving her husband from sin.
That might be a cheshbon that you need to negotiate between you and your Rav on one hand, with him guiding her on the importance of setting the table when you are hungry. She might not be eating, per se, because she is ravenous, but can sit with you and enjoy the meal out of love for you.