Someone I know in the real world mentioned latex allergies and condoms.
There are a couple of solutions to this.
1) SKYN condoms. These are made from pure chemical polyisoprene, which is the rubber in latex condoms, but it's synthesized chemically, not made from tree sap. Most people who are allergic to latex are actually allergic to the proteins in the tree sap, not the actual latex rubber.
SKYN is pretty good, whether you have an allergy or not.
However, SKYN is like natural latex and susceptible to oils and should only be used with water based lubricants. No oil of any kind with either type.
There's at least one other brand of polyisoprene condom.
2) Polyurethane condoms
These are made from a different chemical than natural latex.
They can stand up to most oil based lubricants.
They're very strong, but don't stretch like latex/polyisoprene. Some people say they may break more often or don't stay on as well. If you're concerned, buy some and stretch them and see how hard they are to break.