We consider the prospects for detecting effects due to the Higgs exchange diagram in high energy µ + µ − , e + e − , and τ + τ − collisions producing a pair of W bosons. The processes l + l − → W + W − (with l = µ, e, τ ) are analyzed, analytically and via numerical simulations, to determine the center of mass energy, √ s H , where the effects from Higgs exchange become relevant. The scaling of √ s H with the mass of the incoming leptons is also studied. Special consideration is given to the W + W − → l ± ν l jj final state after experimental acceptance cuts are imposed. Angular cuts are shown to be able to significantly lower √ s H .