cristycurves said:
can a person be motivated by desires that are not ultimately selfish

.......and how come Bolt never answered my question

There's two for you
Cristy, Bolt's balls are, indeed, the size of Montreal, on maps of a certain scale.
As for your first question, self interest and selfishness are often, but not always, the same thing, so the answer is yes. One can be motivated by self interest, without being selfish. This is common in any 'barter' transaction, or in digital file sharing.
In the case of an Escort-client business transaction, a client values the companionship as much as, if not more than, what could otherwise be purchased with the same amount of currency, ie: He would rather spend two hours with an Escort than have 50 coffees at Tim Horton's, 30 Big Macs with cheese, a couple of two-fours of Bud Lite, and some scratch lottery tickets. Other men would chose the latter option. The Escort would rather have the money from his pocket than the additional unpaid leisure time, some of the time. Each party acts with self interest, but neither need necessarily be selfish.
In digital file sharing, the original seeder retains his or her copy, and makes duplicate copies for other people. There is self interest involved, but not selfishness.
Any 'anonymously charitable' act is, by definition, not selfish, but there are non monetary personal gains from such acts. Anyone who acts with neither selfishness nor self interest will have an abundance of temporary friends, as illustrated in this commercial, directed by Justin Reardon: