To me, "meaningful sex" is an oxymoron.
IMO, you have 3 basic options;
1) F*cking: all-out dirty, shag-nasty animalistic, "I couldn't care less about you, but could you please lift your left leg a little higher?" kinda thing.
2) Having sex: Bumping uglies with someone you sorta care about, but probably wouldn't lose any sleep over if they never called you again.
3) Making love: Self-explanitory. No comparison with the preceeding 2 categories.
FWIW, YMMV.