How do I figure out which size condom to buy? And which kind?

If the condom is for a guy who is really big there are a couple of brands that are larger and will fit better, for normal size most any brand will fit and there are smaller sizes available over the internet and maybe at a specialty store.

Natural lamb is an expensive option but it feels pretty good.

For a guy you probably don't want to get ribbed or textured condoms or one that is designed "for her pleasure" because they could irritate the bottom's skin.

Most people prefer latex to the synthetics but if there is a possibility of a latex allergy you should use one of the synthetics. For me, it's always kind of depended on my mood. For more surface action (as a top) I like latex and for more temperature transfer (from the inside of my partner's body to mine) I like the synthetic.

One last suggestion, remember to add some lube to the inside of the condom before you roll it on, it makes a big difference.

Have fun!

unless u got horse like qualities just get reg size , lifestyle works fine,less costly then trojan

Your best bet - talk to the pharmacist.

i use the jumbo xxl