now I like to give out a good spanking now and then but damn some of those are just wrong
The line-welts aren't caused by spanking, that's from caning (like the gal in the last pic is holding, even tho the other girl's ass isn't cane marked - fake).
If you guys are gonna try it, practice on a pillow or something to get good with it. It's a harder skill to learn than you'd think, and an overly severe blow will at least ruin the mood unless the chick is real masochist.
Never cane a girl while she's bent over. It exposes her tailbone - break that and it's all over. Have her lie flat on the bed for starters. Aim for the lower ass and upper thighs, and definitely steer clear of her back unless you want to damage her kidneys and go to jail.
Also, smack your inner thigh a couple of times when you're alone. That will give you a good idea of how hard you DON'T need to swing.
Have fun kids. SSC.