The good HUDs are fairly pricey but 100% worth the money, they will make sharing intimacy with your partners SO much better.
I recommend the following three as the best on the market but would love to hear if anyone has seen anything newer:
Tender Love HUD
https://marketplace.secondlife.com/p/TenderLove-402-Owner-Shopping-Bag-with-Coin/1745726
Kama Sutra HUD
https://marketplace.secondlife.com/p/KAMA-SUTRA-Sex-HUD-40-Art-of-Erotic-lovemaking-500-Sensual-Animation-sets-Rez-soft-Rugs-Fireworks/575714
TNT Sex HUD
https://marketplace.secondlife.com/p/TNT-SEX-HUD-currently-Second-Life-Most-Advanced-Animations-Engine-Unique-Collection-of-animations/580091
These all have options to adjust positions for different height avatars.