Day in and day out, we're both either at work or with our twins, with only about two hours (or less on those kids-hate-the-bedtime-routine nights) each night after the twins go to sleep where we are alone. And, we've had very few dates over the last two years (literally, about one or two handfuls). Shit, we haven't even gone to the store together by ourselves in months.
A few months back, Hus and I decided that we were going to work on finding some alone time together. We started by finding a babysitter and planning one night out a month. Check. Then, we wanted to make it a little more interesting. So lately, Hus and I have been sneaking off together. For about an hour in the middle of the day. Hus will come pick me up from work, and we'll go... to lunch. I know, it's not that exciting. But, it's been really nice. And it feels like an affair. We're by ourselves (the kiddos are at school), we're being sneaky (it's in the middle of the day on a weekday), we don't have a lot of time and are rushing (we're both on our lunch breaks), we're spontaneous about it (one of us will call the other and quickly plan the "date"), and we're having a lot of fun (we actually get to talk about stuff without being interrupted by a toddler or distrupted by extreme fatigue).
Keep things interesting by having an affair... with your partner. Whether you decide to go to lunch or actually meet for a sexual rendezvous, sneaking away from your everyday, routine life with your mate can easily spice things up in your relationship- even if it is just a simple kid-free lunch at Wendy's on your lunch break.