The love and affection that comes with making passionate love helps a lot in keeping the fire alive in your relationship.
What about a lesbian threesome? If you decide to make it a Male-Male-Female threesome, then your girl would definitely enjoy having two dicks rubbing on to her at the same time.
Homemade Threesome Yes, threesomes might be out of the question for a lot of people.
The only challenge here is that you would need to keep your dick up all night in order to return the favor to these dick-hungry sluts.