you are asking the wrong crowd here. Most of these guys would be happy if a chick, any chick, hell even if it is a guy that put on a wig, showed their to them.
Much less a choice from a chick of having sex or having sex in the putang or anus.
A better question to this crowd would be: When paying 1,000 to an underage Thai whore would you rather stick it in her Putang or Ass?
If given the choice where would you stick your meat