Fijinut, thanx for alimenting the conversation.
My experience is that sexual desire accounts for a very large percentage of sense desire (more than 45 as you suggested). If you compare, the pleasures of other sense organs are much easier to give up. I have no difficulty to give up listening to music although I used to do it all day long. But if I have even one sexual relation, it keeps bothering me for months. Fondness of perfumes is also usually easy to give up. Just to show that the pleasures of the different sense organs do not all impact the mind with the same depth.
The Buddha gave also different other sets of requisite conditions for practicing seriously:
Cha, bhikkhave, dhamme appahāya abhabbo uttarimanussadhammaṃ alamariyañāṇadassanavisesaṃ sacchikātuṃ. Katame cha? Muṭṭhassaccaṃ, asampajaññaṃ, indriyesu aguttadvārataṃ, bhojane amattaññutaṃ, kuhanaṃ, lapanaṃ.
Bhikkhus, without dispelling six things it is not possible to realize some noble distinction above human. What six? Forgetfulness, unawareness, uncontrolled mental faculties, not knowing the right amount to eat, deceitfulness and talking deceptively.
Cha, bhikkhave, dhamme appahāya abhabbo kāye kāyānupassī viharituṃ. Katame cha? Kammārāmataṃ, bhassārāmataṃ, niddārāmataṃ, saṅgaṇikārāmataṃ, indriyesu aguttadvārataṃ, bhojane amattaññutaṃ.
Bhikkhus, without dispelling six things it is not possible to abide reflecting the body in the body. What six? Fondness for activity, fondness for talk, fondness for sleep, fondnes for company, non-control in the mental faculties and not knowing the right amount to eat.
Aṭṭhime, bhikkhave, dhammā sekhassa bhikkhuno parihānāya saṃvattanti. Katame aṭṭha? Kammārāmatā, bhassārāmatā, niddārāmatā, saṅgaṇikārāmatā, indriyesu aguttadvāratā, bhojane amattaññutā, saṃsaggārāmatā, papañcārāmatā.
Bhikkhus, these eight things conduce to the decrease of the trainee bhikkhu. What eight? Fondness for, activity, talk, sleep and company. Lack of control of the mental faculties. Not knowing the right amount to partake food. Fondness of company and fondness of papañca (definition of papañca here: http://www.accesstoinsight.org/tipitaka ... .than.html
Note that indriyesu guttadvāratā and bhojane mattaññutā are defined in the Anupubba Paṭipadā (The Gradual Path): http://www.suttapitaka.net/formulae/bhojan.html