You do understand that asking about her ex-boyfriends is not the best online dating question to ask a woman.
You can also suggest swapping phone numbers in case something comes up at the last minute. Ask for elaboration when appropriate and if your guy is particularly brief when answering a question, you may want to ask some follow-up questions to get more details. While dirty talk gets them excited, so does the equally sensual cuddle talk. You want to be there for her, protect her, and this is a massive turn-on for women. We all have something we are proud of and we all like to talk about our achievements.