The approriate and usually required dancebelt to wear under tights is the thong type and some good brands are Capezio and Star Styled. The thong dancebelts (there are some seated ones too) do not show lines under your tights plus they give very good firm support that males need. Because males are usually required to have their tights pulled up tight, it is also usually required that you wear your "front" in the up position in the dancebelt's pouch. This may take some getting used to but after awhile it will feel natural. The pouch is usually made of a material called poplin which does not stretch because another job of the dancebelt is to control you. Let's face it, it can be easy to be turned on when wearing tights and the dancebelt will help save you some noticeable embarrassment (a jockstrap can't control this). Capezio makes some thong dancebelts that have a quilted pouch in them which helps prevent, well let's just say, the quilted pouch does something sort of similar to what Depends undergarments does -- if you leak a little, usually the quilted liner will absorb it.
Get used to wearing tights and dancebelts and if you go to a gym, wear some male athletic tights (get the tight fitting types) such as nylon/lycra from sporting goods stores and of course wear a dancebelt under it. Lots of guys wear a dancebelt under their tights, unitards, bike shorts, etc.
As for that "guys stuff", what are you referring to?[/i]