That doesn't quite answer the question for me. What does "really liked a customer" mean in this case exactly? Does it mean she likes the guy because he's dropping a lot of money on her at work, or does it mean she likes the guy because she wants him to bang her after work?
I meant how does a stripper prove to a customer (i.e., someone she met at work) that (unlike 99% of her customers) that she really likes him in real life.
Top 38 signs of a stripper being interested in a customer in real life:
0) Giving her number to another person to give to him (often the introduction).
1) Offering him her real name without being asked.
2) Offering to meet him outside the club for any reason within the next 24 hours.
3) Taking him to meet her non-stripper friends outside the club.
4) Inviting him to her birthday or private party.
5) Giving him her number without being asked.
6) Meeting his parents (hopefully not in VIP).
7) Leaving the club with him.
8) Going to the club while off duty and on a date with him.
9) Introducing her real friends (often coworkers at the club).
10) Calling him late at night, often the night they met.
11) Responding to romantic texts (versus the "my rent got stolen how much u paying" attitude).
12) Replying to texts nearly always.
13) Kissing him at the club for a long time in front of everyone (versus in VIP).
14) Walking outside the club with him to say goodbye.
15) Sleeping over.
16) Going out of town with him on an overnight date.
17) Wanting more sex than he does.
18) Asking him to come inside her (warning - could be baby trap though strippers don't tend to do that).
19) Not requiring protection (versus treating him like he is contaminated and triple-checking the condom).
20) Wanting to have a talk about "something more".
21) Having sex at her club without being paid the night you meet up front or any talk about money.
22) Bringing him to her house.
23) Texting "love" or saying "I love you".
24) Texting hearts.
25) Randomly showing up at his house uninvited.
26) Refusing money.
27) Having really long texts and conversations.
28) Having sex for free.
29) Getting on a plane to see him (even if he is covering expenses).
30) Asking him for a photo of himself, or taking one.
31) Texting him lots of photos of herself.
32) Wanting to take a selfie with him.
33) Getting upset with him and storming off for reasons not involving money (indicating she cares).
34) Paying him back money she owes him.
35) Taking part in a 3 way kiss with him and another girl.
36) Saying "Isn't he hot?" to other girls and generally singing his praises (versus saying "You're hot" to him which they all say and not having any comment about his looks).
37) Connecting on Facebook (normally not a big deal but for strippers it is).
(your experience here)
You need to get at least 3 of the above to have a good chance IMO. But remember: a good percentage (maybe even half) of dancer's boyfriends are men they met at the club.
And do note how rare strippers do any (letalone many) of the above.