(Portland, OR)  --  A man is accused of walking to a party in northeast Portland naked and sexually assaulting a woman.  Robert Engelsman allegedly walked into a home near 36th and Klingsworth Street naked around 1:00 Sunday morning.  A housewarming party was taking place in the home and nobody in attendance knew who Engelsman was.  An affidavit said Engelsman began inappropriately touching a woman in the kitchen before other partygoers ran him out of the house.  During a police interview, Engelsman admitted he had been sniffing glue and drinking before the incident.