My experience has been, if condoms are not brought up at any point during the planning stages of sex and the bottom doesn't have any himself when you meet in person, they are cool with being barebacked. A bottom that wants to have safe sex should always have condoms available in the event the top does not bring his own.
Case in point, I was texting with a divorced dad where to meet me for our first fuck and we talked about time, directions and finally he asked me if I had lube....but he never once mentioned if I had condoms or not. When we were at the point where dick is inserted into ass, I went to grab a condom that I brought to see what he would say and as expected he said "you don't need to use one with me as long as you're disease free." I fucked him raw of course.