Am I Saint or Sinner?

I've been told by friends I have a tendency to go for big girls and train them to lose weight.

I am a part-time fitness trainer and feel a huge connection to women who also put in the time to be fit. With bigger girls it's usually a more fruitful adventure.

Most girls I train are already fit, and it's quite boring, girls who need to lose say, 20-40lbs are just more fun to work with and I love how I can tell they get more excited with every pound they lose. I find it hot.

So I've been labeled with a joke fetish along the lines of " trainer fetish " ha.

Some friends say I'm a bad person for this because I won't be with a big girl unless she puts in effort to get fit.

I can see their argument, so I'm curious what opinions are on here.
Am I Saint or Sinner?
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