One couple is kissing against a wall while another looks on from atop the wall.
a couple is making out on the side of a house while others are watching
Making out is a rephrasing of kissing and looks on implies watching.
exists e1 p1 x1 x2.(exists e2 x3.(r_on(e2) & from(e2,x2) & r_atop(x2) & Actor(e2,x3) & v_look(e2) & n_thing(x3)) & n_wall(x2) & n_wall(x2) & while(e1,p1) & against(e1,x2) & Actor(e1,x1) & v_kiss(e1) & n_couple(x1) & card_eq_1(x1))
exists e1 p1 s1 x1 x2 x3.(n_person(x2) & n_side(x2) & exists e2 x4.(Actor(e2,x4) & v_watch(e2) & -(x4 = x2) & n_person(x4)) & while(e1,p1) & a_out(s1) & Manner(e1,s1) & on(e1,x2) & of(x2,x3) & n_house(x3) & Actor(e1,x1) & v_make(e1) & n_couple(x1))