WordNet sense 1 (sensible and practical):

down-to-earth

WordNet sense 2 (aware or expressing awareness of things as they really are):

realistic

WordNet sense 3 (in accordance with nature; relating to or concerning nature):

natural

WordNet sense 4 (not inhibited or restrained):

uninhibited

WordNet sense 5 (conspicuously and tastelessly indecent):

coarse, crude, gross, vulgar

WordNet sense 6 (offensive to good taste especially in sexual matters):

indecent