By willing I mean both partners agree. Moral is to vague and is defined as many things to many different people. To say sex is moral or immoral really doesnt matter. What matters, when two people consent to participating in the act of sex, is the individuals involved. People shouldn't judge those who have casual sex.
Adults going to bars are old enough to make the right desisions.
I say just do it. Those who critize casual sex are those who feel it is there right to make judgment on people, in my eyes god is that person.