While I often find myself attracted to girls with tat's, it's not really to do with the artwork itself.
Generally, I do find that gals with ink are more interesting, more open minded, & less inclined to be scared of challenging (&/or completely ignoring) many social norms.
Of course, their are still many women who have these wonderful traits without wearing the body mod's to advertise it. just as there as girls who wear the ink & metal, however fail to really do anything other than wave the flag.
In all fairness, the type of artwork I'm talking about isn't a kitten on the front of the hip. it's more along the lines of a half sleeve, with more design work visibly protruding above the collar, & accompanied by at least one or two visible piercings.
So, I guess that, ultimately, it probably depends more on how you carry yourself, & how you treat other people.
If you wear your ink with arrogance, thinking that it in itself makes you special or different, then no. It won't make you sexier.
If you wear your ink with confidence instead of arrogance, then yes. It will increase your sex appeal.
NB: Some guys won't look at women with ink - just some guys won't look at women without it.