Are some insects bisexual

Yes, the following species of insects have been observed in bisexual and/or homosexual behavior:

Alfalfa Weevil

Australian Parasitic Wasp

Bean Weevil

Bedbug and other Bug

Blister Beetle

Blowfly

Broadwinged Damselfly

Cabbage (Small) White (Butterfly)

Checkerspot Butterfly

Club-tailed Dragonfly

Cockroach

Common Skimmer Dragonfly

Creeping Water Bug

Cutworm

Digger Bee

Dragonfly

Eastern Giant Ichneumon Wasp

Eucalyptus Longhorned Borer

Field Cricket

Flour Beetle

Fruit Fly

Glasswing Butterfly

Grape Berry Moth

Grape Borer

Green Lacewing

Hen Flea

House Fly

Ichneumon wasp

Japanese Scarab Beetle

Larch Bud Moth

Large Milkweed Bug

Large White

Long-legged Fly

Mazarine Blue

Mexican White (butterfly)

Midge

Migratory Locust

Monarch Butterfly

Narrow-winged Damselfly

Parsnip Leaf Miner

Pomace fly

Queen Butterfly

Red Ant

Red Flour Beetle

Reindeer Warble Fly (Hypoderma tarandi)

Rose Chafer[disambiguation needed]

Rove Beetle

Scarab Beetle (Melolonthine)

Screwworm Fly

Silkworm Moth

Southeastern Blueberry Bee

Southern Green Stink Bug

Southern Masked Chafer

Southern One-Year Canegrub

Spreadwinged Damselfly

Spruce Budworm Moth

Stable Fly

Stag Beetle

Tsetse Fly

Water Boatman Bug

Water Strider