Dildo
Some might have a question mark floating over their heads with the title of this idea. Others might know that dildo is the English word for "vibrator." Now, there might be some who are taken aback, although surely not many ;)
Vibrators are made from all kinds of materials—metals (gold and silver usually), silicone, rubber, cyberskin (a material that feels remarkably similar to human skin), Pyrex glass, etc. The type of material determines the fundamental properties of the vibrator: durability, malleability (many have wires inside to permanently adapt their shape), conditions for sterilization (for example, if it can be boiled). It's worth carefully studying all the options so that the purchased product adapts in touch and firmness to what is desired.
Regarding size, there's a whole range from just over ten centimeters to real "baseball bats" of about thirty centimeters. From a physiological point of view, just over eight or nine centimeters are enough to stimulate the vast majority of a woman's nerves. Surveys show that the most comfortable sizes tend to be "normal" sizes. However, since sexual pleasure has a strong mental component, XXL sizes can provide an extra thrill and enjoyment to the relationship. Also, if what you really want is to enjoy a member exactly like your partner's, you'll find kits to make your custom vibrator (basically, the kit brings a mass to make a mold, which we then fill with a special paste that solidifies to complete the cloning).
Of course, there are all kinds of extras that complement the vibrator: ridges, a motor for vibration, protrusions to stimulate other areas in parallel... Additionally, since the sex industry doesn't miss a detail, you'll find some vibrators with the most varied shapes (special mention goes to this vibrating duck... Technically, it's more of a vibrator than a dildo, but it's worth mentioning for its curiosity;)).
Finally, needless to say, hygiene is a crucial aspect when using these types of toys. Be very careful with this, as if you don't take care and don't sterilize the toys after use, they can become a source of infections.