Most men's libido will be negatively affected by a cycle without test but for some there is no effect. For a few drugs like d-bol actually increase sex drive.
If you're that concerned and you don't want to use test, take 50mg/day of proviron through your cycle. It will maintain or increase your libido, act as an anti-estrogen, and make more of the gear you are using available to activate anabolic receptors.
On the downside it can aggravate acne, balding, and prostrate problems and this may be why you're avoiding test...I don't know.