I've never played casually, so I can't speak on that. I do find that in a relationship, it's essential to have outside interests to keep the relationship fresh. I've also found that beyond having things in common that you enjoy, it is really, really, really important to have similar energy/activity levels and similar outlooks on life. I've found that to be true in strictly vanilla relationships as well. If you want to be out hiking and kayaking every weekend, and don't get ruffled by drivers who cut you off, whereas your partner wants to be inside reading and doing puzzles and is quickly upset by snippy people, you're probably going to have problems beyond any issues you might have in bed.