I believe both are equally important: you have to be able to kiss your significant other and imagine yourself (possibly if you are mature enough and of age) sleeping with them.... My past boyfriends have all had something that repulsed me and though their attitude/personalities where awesome (ok maybe except my first boyfriend who ended up being a jerk... ^^") I grew bored of them and could no longer muster the desire to kiss them... :( i have to find someone who's personality fits with mine and who I am attracted too, without both, eventually (i'll) get bored. :( :(