I used to wait and make them wait for penetrative sex. I did feel the relationships in which I did that went my way, as such. They fell for me. Maybe coincidental (?)
However .... Big however, I realised that in two or three cases, I was then too attached and invested at several months in, to react the way I should have to sexual incompetence and other sexual issues (premature ejaculation, lack of foreplay, lack of oral skills, lack of manual skills, selfishness, cluelessness, perfectly happy to go along with no orgasm for me if I let them etc etc).
Maybe if I'd had sex straight off and discovered these things early in the (potential) relationship, I'd have ended it. Instead of being too invested and emotional to do so and then putting up with a shit sex life for months or years.
As for this blokes profile, I don't know if he means he's after casual or not.
Take it slowly ... If he means, take it slow commitment wise but not sexually; hmm, no mate.
Sexual chemistry doesn't need tested with sex anyway, kissing etc is enough