It basically depends on the guy
Some are 100 percent hetero and might only do muscle worship and domination while others are more fluid and open to oral mutual body contact duo jerking off etc....
I've performed oral on some guys in the past and we've done duo jerk offs, but currently with Covid I'll do muscle worship meetups but won't go down on the guy as my personal preference
In my past experiences if a guy offers meetups only on the best flex website I found him to be mostly into muscle worship and domination only but if they also had a profile on RM they were more open to stuff beyond muscle worship