The agency, formerly known as Trafficbroker, won the business following a pitch against BigMouthMedia.
Richard Longhurst, co-founder and director of LoveHoney, said: "With sales up 50% year on year we wanted an agency that has the ability to continue driving our rapid growth.
"Forward3D's understanding of consumer behaviour online means they are able to develop an intelligent approach to search and deliver a campaign that will truly help us continue to expand at this rate."
The LoveHoney business is the search marketer's first win since it rebranded from Trafficbroker in January.