The classic 2" side racing speedo is a smooth front bikini, many men claim that there is no room for their bits there in a manner that boasts about their endowments. This may be because they are rather large or are covering up the fact that they are a bit tiny or they are afraid of getting an erection and showing an obvious bulge.
If you feel you are on the tiny side of the scale get the skimpiest bikini briefs you can find (or even a swim thong) and celebrate it. Get over being shy about being small.
Average and well endowed men will find that everything goes south with age and seems to get larger. If there's no room in smooth front speedo style bikini then try a pouch brief, the pouch has more space at the front. A pouch brief has a front seam cut on a convex curve to make more space. Addicted in Spain are masters at this style. There is an assumption that your manhood will be gently held upwards when soft in a pouch brief.
https://www.ebay.co.uk/itm/204659010...3ABFBM3q2_9odk
If everything is already going south then your style of bikini briefs celebrates it rather than hides it, everything is allowed to flop and is then supported, a downward facing semi erection isn't a threat to anyone and can be ignored.
It is interesting that you are experimenting with 3/4 and 1/2 cut rears to your bikini briefs if you enjoy how it feels and you don't scare the horses carry on.
If your balls are hanging a bit low have you considered wearing a ball stretcher when you undress to impress, Oxballs in America make some rather impressive ones that can be bought from Uberkinky in the UK.
This link is rather explicit:
https://oxballs.com/shop/ols/product...tinum-silicone
Buy in the UK from:
https://www.uberkinky.com/oxballs-sq...her-85159.html much less explicit.