My craigslist days of trying to get an internet hook up are over... but if we went back in time to the days where I worried more about a cock pic than anything else then being chubby wouldn't bother me at all. My needs were purely sexual and selfish. I didn't even care about the person the genitals were attached to.
I've turned over a new leaf. The person matters more; especially who they are on the inside. By the time I see their cock I've already noticed their physique and weight is not something that bothers me.
Sure, a hot guy with great abs might attract my attention. But it takes a great person to keep that attention.
In general, if I picture a naked guy who is the type to turn me on, he's not chubby. Society has me wired that way. I also imagine a caucasian guy. Perhaps that's upbringing and my own ethnicity. Who knows?
If I'm attracted to the person, then they turn me on. Chubby or not.
Hope this answers your question