There are beers that use less hops than others in their brewing and so will have a lesser impact on your testosterone levels.
Belgian beers tend to be lower in hops than most other European beers.
They are unlike beers from Britain and Germany in that Belgium never regulated beer to be made exclusively from hops.
Belgian beers will have some hops, but there can be any number of other fruits, grains, or even herbs tossed into the mash.
Since there is less hops used, there is less of a lowering effect on your testosterone levels.
The best is going to be a Belgian White Ale which is brewed with wheat and barley.