I think both partners should get involved in spicing things up. Usually taking turns is nice. But maybe one particular day you could hint to your partner throughout the day that you want them. Leave little love notes, sexy comments or anything like that. Then lets say as they walk through the door, whether from work, or where ever, you could surprise them wearing sexy lingerie or your favorite outfit. Make sure there is plenty of foreplay before jumping right into things.

Another idea is perhaps a similar plan, leave hints throughout the day, text messaging, love notes etc, but when they come through the door, have a nice meal prepared and ready on the table. Have some candles lit, but be sitting there completely naked. Good way to build things up by teasing them, they can look but not touch till after the meal etc.

These types of surprises are good to do from time to time, but if done too often, it might become routine also. Hopefully what I have said helps less