emmm im sorry to burst ne1s bubble but i think tht its their bizness wat they r doing because they are married and can do wat they like, its wen i c young teenagers doing this that i get annoyed!!!!!!
as for married people, some couples dnt have time at home, husband always at work, wife bizi with housework etc etc so wen they go out mayb its nice for them to hav sum alone time and enjoy an outing and b intimate together....
if it is distracting simply dont look, turn around and carry on with ure own bizness, sometimes its hard to resist ure partner u know ;)