What kind of lubricant works best for very dry *cough* p-pa-parts? Thanks for your help.?

Me & My bf hve been together for a while now and hve decided to start *ahem* hvn 'it'. We tried it out but he wasnt 'wet' enough to well, get the job done. (Slip in) I need ideas for what lubricant to buy cuz he really wants this and i do too. And im sure there are good lubes out there! K, Thx. xox(L)