In my opinion tramp stamps ARE the sluttiest tattoos.

In general I don't like tramp stamps, but then I'm not the market to whom they're supposed to appeal. The one exception is a gay porn star named Jeremy Feist who has a tramp stamp that's just the word "HARDER" in bold block letters about two inches (5 cm) tall. That's a tramp stamp I can respect.

As for what the kids apparently now call a "womb tattoo", well, that name might be new but the style isn't, with gay porn star Draven Torres having had one for at least fifteen years now (mostly SFW pic, no naughty bits)-
i.pinimg.com/originals/35...42169ad37d3d9e66295ec.jpg

I never thought of his tattoo having anything to do with a womb, instead it has always reminded me of a bat skeleton, but I've seen so-called "womb" tattoos that were almost exact copies of his.

A face on/around your asshole, so when you’re taking it anally, the guy is simultaneously giving a blowjob to the face.

Options for whose face can be endless.

Some paw prints wouldn’t hurt~

Something like this, perhaps?-
www.tattoosforyou.org/wp-...Bear-Paw-Print-Tattoo.jpg

Sort of, but maybe a group of them, and definitely would be hotter as a womb tattoo, kind of like this:

rule34.xxx/index.php?page=post&s=view&id=8919122

Ah. You'd definitely want to find out exactly what type of animal the prints are from first, and if they represent anything other than just what they are. The one I linked was a bear print, signifying an attraction to large, hairy, masculine gay men, AKA "Bears". The ones you linked to appear to be canine footprints, most likely fox. I don't know if they have any particular significance or not, but it never hurts to make sure first.

Anyone got any slutty tattoo ideas for straight guys?

A female symbol near the crotch, but the vertical line turns into an arrow that points to the guy's dick.

love me a tramp stamp or a tattoo on the hip bone

Thigh tats

Whatever you go with, make it something that can't be misinterpreted.
If you do something stylized, it gives you the chance to chicken out when somebody asks what it is.

If it says S-L-U-T on your fingers, you're gonna get a lot of free drinks.

And don't go with some skeevy backroom ink-jockey. Not even if they say they're saving up for a shop.
Motherfucker can save up apprenticing at a respectable shop.