wear something smart like a shirt with a tie i wear this stuff everyday, and be a gentleman!
wear some perfume, but not too much or you'll put off your date.
chew gum too. bad breath is an instant turn off.
and in deep seriousness, take a condom.
you'll never know what will happen tonight.
not only for love, the condom can be used as a water carrier (in case some natural disaster happens or something) and a container.
always be prepared.